What Is the CheapUno Debug Kit?
The CheapUno DIY Debug Kit is a structured troubleshooting checklist designed specifically for Arduino clone beginners. When your $3 board from AliExpress or eBay doesn't work, this kit tells you exactly what to check and in what order.
Free preview below — or get the complete kit.
Also: Visual Inspection Guide
Before you start with bootloaders and multimeters, try the free Arduino Clone Visual Inspection Checklist — five minutes of looking can save you hours of troubleshooting.
What's Inside the Kit
Checklist.md — A 7-phase debugging flow:
- Power Verification — USB cable check, voltage regulator test
- Connection Inspection — Cold joints, loose wires, breadboard continuity
- Upload Diagnostics — Board/port selection, bootloader check
- Serial Monitor — Baud rate, garbage characters, reset timing
- Code Logic — Variable scope, array bounds, millis() overflow
- Peripheral Issues — I2C scanning, SPI pins, ADC calibration
- ESP32 Specific — WiFi, deep sleep, ADC2 caveats
Wiring-Inspection.md — The 6 most common wiring mistakes:
- Floating pins (unconnected inputs = random noise)
- LED polarity (long leg = anode)
- I2C SDA/SCL swap
- Power voltage mismatches (5V sensor on 3.3V pin)
- Shared USB power overload
- Ground loops
Common-Errors.md — Error quick reference:
avrdude: stk500_recv(): programmer is not respondingesptool.py: Serial connection timed outexpected ';' before '}'- Garbage serial output = wrong baud rate
Frequently Asked Questions
Q: Does this work with Arduino Nano, Uno, or ESP32?
A: Yes. The kit covers all Arduino-compatible boards including Nano, Uno, Mega, and ESP32-based boards.
Q: I'm getting "programmer not responding" errors. Can this help?
A: Yes. This is one of the most common Arduino clone problems and is covered in Phase 3 of the checklist.
Q: I bought a $3 Arduino clone from AliExpress. It doesn't work. Is this kit for me?
A: Exactly. That's the target audience. Most cheap clones have the same 5-6 root causes.
Q: My board was working yesterday but now it won't upload. What changed?
A: Check the checklist. Power regulators on cheap boards often fail gradually.
Q: How is this delivered?
A: After payment, I'll email the complete ZIP file within 24 hours. If I cannot deliver, I refund you.
Arduino Starter Kit Under $10 — Complete Contents
The Arduino starter kit under $10 includes:
- 7-phase power and connection troubleshooting checklist
- Wiring errors quick reference (the 6 mistakes that cause 90% of failures)
- Error code dictionary for Arduino clone-specific messages
- Multimeter tutorial for voltage and continuity testing
- ESP32-specific debugging section
Price: $10 USD — pay what you want, any amount appreciated.
How to Get the Full Kit
Step 1: Pay $10 via PayPal.Me/techer/10
Step 2: Send me a message on Dev.to or email with your PayPal confirmation
Step 3: I'll send the complete ZIP kit within 24 hours
Not satisfied? I refund you. No questions asked.
Why This Works
Most CheapUno problems fall into three categories:
- Power — USB charge-only cable, or dead voltage regulator
- Connection — Loose jumper, cold joint, breadboard continuity
- Software — Wrong board selected, wrong COM port, corrupted bootloader
The checklist takes you through all three, in order, until you find the problem.
Arduino Clone Troubleshooting — The Complete Guide
If you searched for "Arduino clone won't upload" or "Arduino starter kit troubleshooting" — this kit is for you. It covers:
- Arduino debugging checklist
- Breadboard wiring mistakes
- Beginner electronics troubleshooting
- Multimeter Arduino beginner
- Arduino error code solution
- ESP32 Arduino troubleshooting
Free Preview: Power Verification
Phase 1: Power Verification Checklist
- [ ] USB cable provides 5V (check with multimeter)
- [ ] Voltage regulator output: 3.3V or 5V as required
- [ ] Power LED is ON (if present)
- [ ] Current draw matches expected idle draw
Quick thermal test: Touch the chip after 30 seconds.
- Hot (60°C+): Short circuit or firmware crash
- Warm (40-50°C): Normal operation
- Cold: No power reaching chip
Pay What You Want
If this guide helped you debug your project, buy me a coffee:
Any amount appreciated. I'll send the complete ZIP kit within 24 hours of your payment.
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