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Instructor's Guide

This page holds the Purchasing Guide section of the Instructor's Guide. Teaching notes, module pacing and classroom logistics are in the main Instructor's Guide introduction.

Purchasing Guide

The FFT Lab Kit: a Pico 2, a 2.42-inch OLED showing a live spectrum, two push buttons and an INMP441 microphone on a breadboard

The whole course runs on a single kit, the FFT Lab Kit: a Raspberry Pi Pico 2, a 2.42-inch 128×64 OLED display, an INMP441 I²S microphone, two push buttons, a breadboard and wiring. Every one of the 35 labs uses it. One kit costs about \(25** at single-unit prices, about **\)19.50 per student for a class of 20, and about $16 per student at district scale (100+ students). The cheapest route is direct from China, which took 8–15 days in our 2026 orders, so order at least three weeks before the term starts, and four to five weeks for a full classroom set.

Prices checked October 2026

Component prices move, and marketplace listings turn over constantly. Treat every figure here as a planning estimate, not a quote. Prices were checked with web searches of Micro Center, Amazon, AliExpress, Alibaba and specialty retailers on October 18, 2026; figures marked estimate could not be confirmed from a current listing, and each one says how it was estimated.

Don't order the wrong one: Pico 2, not the original Pico

A Raspberry Pi Pico 2 (RP2350) is required. The original Pico (RP2040) looks almost identical in listing photos, but its Cortex-M0+ core has no floating-point unit, so Labs 30–34 (the FPU and assembly labs) cannot run on it. Look for "Pico 2" and "RP2350" in the listing title. Sellers often list both boards side by side, and the RP2040 Pico is cheaper, so it is the one that ends up in the cart.

Summary of Parts List

Required

Optional

Estimated total per kit:

Kit One kit (single-unit prices) Per student, class of 20 Per student, district (100+)
FFT Lab Kit ~$24.74 ~$19.51 ~$16.08

The course description quotes the kit at about $20 per student. A single kit costs more, about \(25, for two reasons: the ribbon cable and USB cable are sold in packs that serve several kits, and single-unit shipping on the display and microphone costs more per piece. If you buy one kit from scratch, the cash outlay is about **\)35**, because you also buy a 100-pack of buttons and a 3-pack of USB cables. A classroom order of 20 lands right on the quoted ~$20. Shared tools, such as the hookup wire, are kept out of the per-student figures.

Raspberry Pi Pico 2 H

Raspberry Pi Pico 2 board, top view, on a light background

Photo: Suyash Dwivedi, CC BY-SA 4.0 via Wikimedia Commons. The photo shows the plain Pico 2; the Pico 2 H is the same board with header pins already soldered on.

Used in: FFT Lab Kit (×1)

Used for: Every lab, starting with Lab 1: Hello World; Lab 28: Does Your CPU Have an FPU? and Labs 30–34 depend on its hardware FPU.

The Pico 2 is built on the RP2350: a dual-core Arm Cortex-M33 at 150 MHz with a hardware floating-point unit and 520 KB of RAM. Every lab runs MicroPython directly on it. Buy the Pico 2 H (the "H" means headers are pre-soldered) so the board itself needs no soldering. The plain Pico 2 is a dollar cheaper but arrives with bare holes along both edges.

Requirements: It must be an RP2350 board with the hardware FPU. Wireless is not needed for any of the 35 labs, so the Pico 2 W is only worth buying for the optional Chapter 28 extension.

Prep work: None. The Pico 2 H is breadboard-ready as shipped. If you buy the plain Pico 2 instead, solder two 20-pin male headers to it, which takes about 15 minutes per board with a breadboard used as a jig.

Cost: ~$4.99 each in quantity 1 (Micro Center Pico 2 H, sale price, regularly $5.99, in-store pickup only; the plain Pico 2 is \(3.99 and ships) · ~\)4.99 each in a classroom order of 20+ · ~$5.99 each at district scale (estimate: Raspberry Pi holds a fixed retail price, so we found no distributor discount and assume the regular $5.99 price). Raspberry Pi lists the Pico 2 from $5.

Trusted sellers: Buy from authorized resellers: Micro Center, Adafruit, SparkFun, Digi-Key or PiShop.us. Relabeled RP2040 boards and clones do appear on general marketplaces. A genuine board has the Raspberry Pi logo, "Pico 2" on the silkscreen, and an RP2350 chip, and the price is close to the fixed retail price. A listing far below $4 is a warning sign.

Search keywords: Raspberry Pi Pico 2 H, Pico 2 RP2350 with headers, SC1632 (the manufacturer part number for the Pico 2 H; SC1631 is the plain Pico 2)

Where to buy:

Micro-USB Data Cable

USB-A to Micro-USB cable, showing both plugs

Photo: Electronicgrup, CC BY-SA 3.0 via Wikimedia Commons

Used in: FFT Lab Kit (×1)

Used for: Lab 1: Hello World and every lab after it. It powers the Pico 2 and carries the Thonny connection.

The Pico 2 has a Micro-USB port, not USB-C. The cable has to carry data, not just power. Charge-only cables look the same, and they are the most common reason a Pico "isn't detected" on day one. Many students already own a suitable cable. If your laptops only have USB-C ports, buy USB-C to Micro-USB cables instead.

Confirm it says data or sync

Look for "data", "sync" or "480 Mbps" in the listing. A cable sold only as a "charging cord" may have no data wires at all.

Prep work: None. Test each cable with a Pico 2 in Thonny on arrival, and label or discard any cable that only charges.

Cost: ~$2.50 each in quantity 1 (Cable Matters 3-pack, $7.49 on Amazon; Amazon Basics 3-pack \(9.44) · ~\)2.50 each in a classroom order of 20+ (seven 3-packs) · ~$1.00 each at district scale (estimate: we could not confirm a current bulk listing, so this assumes the same roughly 60% discount we saw on the other commodity parts in China-direct bulk orders).

Spotting a bad batch: A charge-only cable or a loose plug shows up as a Pico 2 that is missing from Thonny's port list. Test on arrival and replace the odd dud rather than returning it.

Search keywords: micro USB data sync cable 3ft, USB-A to Micro-B data cable, USB-C to Micro-USB data cable

Where to buy:

2.42-inch OLED Display (SSD1309, SPI)

2.42-inch white OLED display running a clock, showing the size and readability of the module

Used in: FFT Lab Kit (×1)

Used for: Lab 4: The OLED Display onward, including Lab 8: Sound Levels, Lab 21: Spectrum of a Real Sound, Lab 23: Build a Tuner and Lab 24: Real-Time Spectrum Analyzer. It is the only visual output in the kit.

This is a 2.42-inch, 128×64-pixel monochrome OLED module. We chose the 2.42-inch size over the common 0.96-inch one because a spectrum is readable from across a table. The modules use the SSD1309 controller. The course's ssd1306 MicroPython driver works with it unchanged, and config.py already notes both chips. The colour (white, blue, yellow or green) is a matter of taste.

Requirements: It must be the 7-pin SPI module board (pins GND, VCC, SCL, SDA, RES, DC, CS), because config.py and every wiring diagram assume SPI on GPIO 2–6.

Confirm the 7-pin SPI module, not a bare panel or the 4-pin I2C version

Two lookalikes turn up in the same search. The 4-pin version is I2C-only and will not match the labs without code and wiring changes. A bare 24-pin panel with a thin ribbon (0.5 mm pitch) cannot plug into a breadboard at all. Count seven pins in the listing photo. Seven-pin boards ship set to SPI by default (I2C needs resistors moved), which is what you want.

Prep work: Usually none, because most 7-pin modules ship with the header already soldered. Check the listing photo; if the header is loose, soldering it takes about 5 minutes. The optional wiring harness described in Lab 4 takes about 10 minutes per kit and saves a lot of "my display went dark" debugging later.

Cost: ~$7.20 each in quantity 1 (AliExpress, TZT 7-pin SPI listing at \(7.15–\)7.26; the same module is \(13.99 on Amazon for fast domestic delivery) · ~\)7.20 each in a classroom order of 20+ · ~$6.50 each at district scale (factory listings at \(6.41–\)7.90 with a 3-piece minimum order). This is the most expensive part in the kit, and the one where ordering ahead saves the most.

Spotting a bad batch: Look for dead pixel rows, a cracked glass corner (the panel extends past the circuit board), or a module that stays blank with known-good wiring. Run Lab 4's test pattern on every display on arrival.

Search keywords: 2.42 inch OLED SSD1309 SPI 7 pin, 2.42" 128x64 OLED module, 12864 OLED SSD1309

Where to buy:

INMP441 I²S MEMS Microphone

INMP441 microphone breakout board, round, with a loose six-pin yellow header beside it

Used in: FFT Lab Kit (×1)

Used for: Lab 7: Your First Sound Capture and every audio lab after it: Lab 8, Lab 9, Lab 10, Lab 21, Lab 23 and Lab 24.

The INMP441 is a digital MEMS microphone with its own amplifier, filter and 24-bit ADC on board. It sends samples straight to the Pico 2 over I²S, so it needs no analog circuitry. Buy the INMP441 by name. Lookalike "INMP441-compatible" modules (MS3625, MS4030) are cheaper, but the labs were tested on the INMP441.

Prep work: Some minor soldering required. Most listings ship with the six-pin header loose, as in the photo, and soldering the headers takes about 5 minutes per board. This is the only soldering in the kit. Some listings are sold as "solderless" with the header already fitted, and these are worth the extra few cents if you want a no-solder kit. When wiring, students must not skip the L/R pin: Lab 7 ties it to GND.

Cost: ~$3.00 each in quantity 1 (AliExpress singles at \(2.19–\)4.39; an Amazon 3-pack is \(8.54–\)9.99) · ~$1.00 each in a classroom order of 20+ (AliExpress listings around \(0.99) · ~\)0.89 each at district scale (an Alibaba tiered listing at $0.89 for 10–999 pieces and $0.79 at 1,000+).

Spotting a bad batch: A dead or badly soldered microphone reads as all zeros, or as one constant number, in Lab 7, which looks exactly like a wiring mistake. Check the solder joints first, then swap in a spare. At $1 each, buy two or three extras rather than returning duds.

Search keywords: INMP441 I2S microphone module, INMP441 MEMS omnidirectional, INMP441 solderless

Where to buy:

Momentary Push Buttons (6×6 mm)

Momentary tactile push button with a round cap and four leads

Used in: FFT Lab Kit (×2)

Used for: Lab 5: Buttons and Interaction, Lab 6: Deploying Code, and mode switching in the tuner, the analyzer and the Lab 35 capstone.

Standard 6×6 mm, four-leg, through-hole tactile switches. Each button connects one GPIO pin (GPIO 14 or 15) to GND and uses the Pico's internal pull-up, so no resistor is needed. Caps are optional, but they make the buttons easier to press.

Prep work: None. They are breadboard-ready as shipped. Show students that the four legs are two connected pairs, so a button set across the breadboard's center gap is the reliable way to place it.

Cost: ~$0.10 for two in quantity 1 (a 100-pack is $4.99 on Amazon, about \(0.05 each) · ~\)0.05 each in a classroom order of 20+ (one 100-pack covers 20 kits with 60 spares) · ~$0.04 each at district scale (Alibaba 4-pin 6×6 mm switches at a 1,000-piece minimum order).

Spotting a bad batch: Look for legs bent too short to seat, or switches that stay closed or never click. Discard the odd bad one; the 100-pack has plenty of spares.

Search keywords: 6x6mm tactile push button 4 pin, tact switch 6x6x5 DIP, momentary tactile switch

Where to buy:

Solderless Breadboard (830 Point)

Full-size 830-point solderless breadboard, transparent, with power rails along both edges

Photo: oomlout, CC BY-SA 2.0 via Wikimedia Commons

Used in: FFT Lab Kit (×1)

Used for: Every wired lab from Lab 4 on. It holds the Pico 2, the display cable, the microphone and the buttons.

A full-size 830 tie-point breadboard, about 6.5 × 2.2 inches, often sold as "MB-102". Buy the full size: the half-size 400-point boards used in other kits are too short to hold the Pico 2, two buttons and two cable headers without crowding.

Prep work: None. It is breadboard-ready as shipped. Optionally, mark the 3V3 and GND rails with a permanent marker, since the most expensive mistake in the course is a display wired to 5 V.

Cost: ~$2.00 each in quantity 1 (an Amazon 10-pack at $19.99; a single board is \(6.94 from Circuit Specialists) · ~\)1.10 each in a classroom order of 20+ (AliExpress MB-102 listings at \(0.68–\)2.61, most around \(0.99–\)1.21) · ~$0.40 each at district scale (Alibaba listings at $0.40 for 5–49 pieces, plus a flat shipping charge).

Spotting a bad batch: Cheap breadboards are sometimes factory seconds. The usual defect is a rail or row clip that is not bent properly, so wires will not seat or make only intermittent contact. Test each board with a jumper on arrival and throw out the odd bad one. Returns are not worth the time at $1 a board.

Search keywords: 830 point solderless breadboard, MB-102 breadboard, full size breadboard

Where to buy:

Male-to-Male Jumper Wires

A bundle of male-to-male breadboard jumper wires in assorted colors

Used in: FFT Lab Kit (×1 set)

Used for: Lab 4 and Lab 5: the short breadboard-to-breadboard links for power rails, ground and the buttons.

A mixed-length set of male-to-male jumpers with pin ends that plug straight into breadboard rows. Each kit needs only about ten wires, so a 65-piece set can be split among several students if you prefer.

Prep work: None. They are breadboard-ready as shipped.

Cost: ~$2.00 per set in quantity 1 (65-piece sets at \(1.99–\)5.50) · ~\(2.00 per set in a classroom order of 20+ · ~\)1.00 per set at district scale (estimate: we found no current bulk listing, so this assumes the same roughly 50% bulk discount as the ribbon cable below).

Spotting a bad batch: Pin ends that snap off or wobble in their crimp are the usual defect. They cause intermittent faults that look like code bugs. Throw out any jumper whose tip moves.

Search keywords: breadboard jumper wires male to male, 65 pcs jumper wire kit, dupont jumper M-M

Where to buy:

Dupont Ribbon Cable (Male-to-Female, 20 cm)

A multicolored Dupont ribbon cable with male pins on one end and female sockets on the other

Used in: FFT Lab Kit (×13 wires, about one-third of a 40-wire ribbon)

Used for: The 7-wire display cable in Lab 4 and the 6-wire microphone cable in Lab 7.

A 40-wire ribbon of Dupont jumpers, with a female socket on one end and a male pin on the other. Peel off a strip of seven wires for the display and six for the microphone. The female ends push onto the module's header pins, and the male ends go into the breadboard. One 40-wire ribbon makes cables for three kits.

Prep work: Peel the ribbon into 7-wire and 6-wire strips. It takes about 2 minutes per kit. Keep the strips intact, because a ribbon strip stays in pin order and is far harder to miswire than loose jumpers.

Cost: ~\(2.95 per 40-wire ribbon in quantity 1 (US\)2.95 at PiShop; €2.49 in Europe) · ~$1.00 per ribbon in a classroom order of 20+ (AliExpress kits from about $0.99), about \(0.33 per kit · ~\)0.65 per ribbon at district scale (an Alibaba listing for 40-pin 20 cm M-F), about $0.22 per kit.

Spotting a bad batch: Female sockets that are too loose to grip a header pin. Test-fit one strip on a module header when the order arrives.

Search keywords: dupont jumper wire 40 pin male to female 20cm, M-F dupont ribbon cable, 40P jumper wire female male

Where to buy:

1.3-inch OLED Display (SH1106, SPI)

1.3-inch 128x64 OLED display on a breadboard showing a clock; this one is the 4-pin I2C version

This photo shows the 4-pin I2C version of the module. For this course, buy the 7-pin SPI version.

Used in: FFT Lab Kit (optional, ×1, replaces the 2.42-inch display)

Used for: The same labs as the 2.42-inch display: Lab 4, Lab 8, Lab 21, Lab 23 and Lab 24. Some students still have this older display from earlier kits.

The 1.3-inch module is the older, cheaper display: the same 128×64 resolution, sold in white or blue. It costs well under half the price of the 2.42-inch display. The tradeoff is size. The active area is about 29 × 15 mm against 55 × 27 mm, so it is smaller and noticeably harder to read. A spectrum or tuner readout that is clear on the 2.42-inch screen from across a table has to be read up close on this one.

Requirements: Buy the 7-pin SPI version (GND, VCC, SCL/CLK, SDA/MOSI, RES, DC, CS) so it matches the book's wiring on GPIO 2–6. The same listings also offer a 4-pin I2C version, which does not match the labs without wiring and code changes.

1.3-inch OLEDs use the SH1106 controller: use an SH1106 driver

Most 1.3-inch modules use the SH1106 controller, not the SSD1306 or SSD1309. The SH1106 has 132 columns of display memory, but the panel shows only the middle 128. The course's ssd1306 driver therefore draws everything shifted 2 pixels, with garbage or a stripe of leftover pixels at one edge. Use an SH1106 MicroPython driver instead, such as the common sh1106.py, and its SPI class (SH1106_SPI) in place of SSD1306_SPI in config.py. The wiring stays the same.

Prep work: Usually none, because most 7-pin modules ship with the header soldered. Check the listing photo; a loose header takes about 5 minutes to solder. Copy sh1106.py to the Pico's /lib folder alongside the other drivers.

Cost: ~$2.95 in quantity 1 (AliExpress EstarDyn "1.3 inch OLED Module" listing: $2.95 for one, \(2.79 each for 2 or more) · ~\)2.65 each in a classroom order of 20+ (the same listing's price for 5 or more) · ~$2.35 each at district scale (Alibaba 7-pin SPI SH1106 listings at \(2.30–\)2.75 with a 30-piece minimum order; one supplier lists $1.98 with no minimum).

Spotting a bad batch: Look for a dead pixel row or a module that stays blank with known-good wiring. If the image is shifted or shows a stripe at one edge, the module is not faulty: you are running the SSD1306 driver on an SH1106 (see the tip above).

Search keywords: 1.3 inch OLED SH1106 SPI 7 pin 128x64, 1.3" OLED module 12864 SPI, SH1106 OLED 7 pin

Where to buy:

Raspberry Pi Pico 2 W

Photo pending. See the image brief.

Used in: FFT Lab Kit (optional, ×1, replaces the Pico 2 H)

Used for: The optional extension Chapter 28: Wake Word Detection, which hands detected audio to a cloud service over Wi-Fi. It also runs all 35 labs exactly as the Pico 2 does.

The wireless version of the Pico 2: the same RP2350, plus 2.4 GHz Wi-Fi and Bluetooth 5.2. Buy it only if you plan to teach the Chapter 28 extension. Note that the onboard LED on a W board is reached as Pin("LED"), and the course's config.py already handles this.

Requirements: It must be the Pico 2 W (RP2350), not the older Pico W (RP2040). The same FPU warning as the Pico 2 applies.

Prep work: None for the pre-soldered "WH" version. The plain Pico 2 W needs headers soldered on (about 15 minutes).

Cost: ~\(6.99 each in quantity 1 (Micro Center Pico 2 W) · ~\)6.99 each in a classroom order of 20+, about \(2.00 more per student than the Pico 2 H · ~\)6.99 at district scale (estimate: we assume the fixed retail price holds, as it does for the Pico 2).

Trusted sellers: As for the Pico 2, buy from Micro Center, Adafruit, SparkFun, Digi-Key or PiShop.us.

Search keywords: Raspberry Pi Pico 2 W, Pico 2 WH, RP2350 wireless

Where to buy:

22-Gauge Solid-Core Hookup Wire

Three 22-gauge solid-core wires with stripped ends, ready to push into a breadboard

Used in: FFT Lab Kit (optional, shared by the classroom)

Used for: Replacing a worn jumper, extending a connection, and the custom wiring students do in the Lab 35 capstone. No lab requires it.

Solid-core 22 AWG wire holds its shape and pushes cleanly into a breadboard, unlike stranded wire. It is usually sold as a six-colour kit of 25–30 ft spools. One kit supplies a whole classroom for years.

Prep work: Cut and strip to length as needed. A pair of wire strippers per table helps.

Cost: ~$14.99 per six-spool kit in quantity 1 (Amazon kits at \(13.59–\)16.19; Adafruit's 6 × 25 ft set is $15.95) · one kit per classroom, not per student · no separate district price (buy one kit per room).

Search keywords: 22 AWG solid core hookup wire kit, 22 gauge solid wire 6 colors

Where to buy:

Things You Do Not Need to Buy

  • A tone source for Lab 9: Sampling Rate and Aliasing and the tuner lab: a free tone-generator app on a phone, or an online tone generator in a browser, works.
  • Software: Thonny and MicroPython are free.

Purchasing Strategy

Lead time is the real tradeoff. Direct-from-China listings on AliExpress and many eBay sellers run 40–70% cheaper than Amazon for the same commodity part. The 2.42-inch display is $7.20 from China against $13.99 on Amazon. Order a semester ahead and the savings are free. Order the week before the unit starts and you pay the Amazon premium.

Ordering lead time

These figures are based on our 2026 orders to Minnesota: 75 deliveries measured from order date to arrival.

Source Orders measured Typical delivery Notes
AliExpress 8 packages 8–12 days (median 9) Every 2026 package arrived within two weeks
eBay 64 orders median 9 days US sellers 3–6 days; China sellers 8–15 days; about 10% took 15+ days, the worst 43 days
Digi-Key — 1–3 days The fastest shipped option for authentic boards
Micro Center — same day In-store pickup; the Pico 2 H is pickup-only

Our recommendation: place AliExpress and eBay orders at least three weeks before you need the parts, and four to five weeks ahead for a full classroom set. That way, a lost or very late package (about one in ten eBay orders took more than 15 days) can be reordered and still arrive in time. Use Digi-Key or Micro Center to fill last-minute gaps: a missing Pico 2, or a few extra cables the week of the lab. Expect longer delays around Lunar New Year, when Chinese factories and shipping largely stop for two weeks or more.

Buy one, then buy twenty. Order a single display and microphone from a seller first, confirm they are the 7-pin SPI display and a genuine INMP441, then place the classroom order with that same seller.

Order spares. Add 10–15% over the class count for the display, microphone and Pico 2. Microphones get mis-soldered, someone wires a display to 5 V, and a dead station in the middle of a lab costs more than the spare. Two spares of each module add about $29 to a class order.

Watch the pack sizes. Much of the classroom savings comes from pack breakpoints (buttons in hundreds, breadboards in tens, ribbons that serve three kits), not from per-unit discounts. Round the order up to the pack, not to the roster.

Buy boards from authorized resellers. Counterfeit and relabeled microcontroller boards turn up on general marketplaces. Micro Center, Adafruit, SparkFun, Digi-Key and PiShop.us sell genuine Pico 2 boards at the fixed retail price.

Expect the odd bad unit, not a bad order. The cheapest breadboards, buttons and jumpers are sometimes factory seconds. Test on arrival and discard the occasional dud.

District-scale orders. For 100+ students, Alibaba factory listings bring breadboards to about $0.40 and microphones under $0.90, at the cost of a minimum order quantity, a flat shipping fee, and a longer lead time than the figures above.

Check your district's purchasing rules first. Many districts cannot reimburse AliExpress or direct international orders and require a domestic vendor with a W-9. If that is your constraint, the Amazon and Micro Center prices are your real prices. Plan on about $30 per student instead of $20.

Classroom Order Worksheet

Part Required? Used in kits Qty per student Qty for 20 students Est. cost for 20
Raspberry Pi Pico 2 H Required FFT Lab Kit 1 20 $99.80
Micro-USB data cable Required FFT Lab Kit 1 21 (7 three-packs) $52.43
2.42-inch OLED (SSD1309, SPI) Required FFT Lab Kit 1 20 $144.00
INMP441 microphone Required FFT Lab Kit 1 20 $20.00
6×6 mm push buttons Required FFT Lab Kit 2 100 (1 pack of 100) $4.99
830-point breadboard Required FFT Lab Kit 1 20 $22.00
Male-to-male jumper set Required FFT Lab Kit 1 set 20 sets $40.00
Dupont ribbon, 40-wire M-F 20 cm Required FFT Lab Kit 1/3 ribbon 7 ribbons $7.00
Pico 2 W upgrade (difference over Pico 2 H) Optional FFT Lab Kit 1 20 $40.00
1.3-inch SH1106 OLED (replaces the 2.42-inch display) Optional FFT Lab Kit 1 20 $53.00
Required subtotal $390.22
With the Pico 2 W upgrade $430.22
With the 1.3-inch display instead of the 2.42-inch $299.22

Per student: ~\(19.51 required · ~\)21.51 with the Pico 2 W upgrade · ~\(14.96 with the 1.3-inch display in place of the 2.42-inch (\)144.00 − $53.00 saves $91.00 for 20 students). Add about $29 for two spares each of the Pico 2 H, display, microphone and breadboard.

Shared classroom tools

These are bought once and reused for years, so they are kept out of the per-student figure.

Tool Cost How many
22 AWG solid-core hookup wire kit ~$14.99 1 per classroom
Wire strippers $8–15 1 per table
Soldering iron and solder (only if you buy plain Pico 2 boards or microphones with loose headers) $15–40 1 per 4–6 students