Launch offer · first 100 buyers
Your Bluetooth module doesn’t work.
This fixes it — and then builds the car.
The 62-page book that names every way an Arduino Bluetooth link fails, plus the eight-lesson course that builds a car you drive from your phone. One payment, both, $9.
After the 100th sale the price becomes $24. Refund within 30 days if it doesn’t help.
- · 62 pages · HC-05, HC-06, HM-10 and the clones
- · 8 lessons · every sketch compiled before it shipped
- · Graded, with a certificate you can link to
- · Instant download · lifetime access to the course
- · 30-day refund, and you keep both
Before anything else
Free tutorials already cover this. Badly.
They do cover the happy path, and they are free. What they disagree about is everything that happens when it doesn’t work — and the number most often repeated for the HC-05’s baud rate is simply wrong. An evening spent finding out which video lied to you costs more than $9.
Is this you?
Eight ways it goes wrong
- It never appears in my phone’s Bluetooth list
- It pairs, then drops after a few seconds
- The Serial Monitor shows ⸮⸮⸮
- Uploading a sketch hangs forever
- AT commands return ERROR, or nothing at all
- It works on Android but my iPhone can’t see it
- Half the AT commands in the tutorial don’t exist on my module
- The module got hot, and now it’s dead
Almost none of these are a broken module. Power, baud rate, line endings and which pins you used account for most of them — and every one of those is free to fix once you know which it is.
What you get
Real pages, real lessons
Everything in it
Thirteen chapters, eight lessons
The book · 62 pages
- 1The four-box model
- 2Which module did you actually buy?
- 3Wire it once, correctly
- 4Prove the link before you write code
- 5Baud rates and the garbage problem
- 6AT command mode
- 7The upload trap
- 8Commands that don’t get mangled
- 9Driving something real
- 10iPhone, Android, the web remote
- 11Building your own controller
- 12Should you just use an ESP32?
- 13The troubleshooting matrix
The course · 3 hours
- 1What you’ll build · 5 min
- 2Kit and setup · 15 min
- 3Blink to Bluetooth · 25 min
- 4Reading commands · 15 min
- 5Driving motors · 40 min
- 6The web-page remote · 30 min
- 7Troubleshooting, and making it yours · 20 min
- 8Bonus: voice control and an autopilot · 30 min
Every lesson ends in something that runs. Lifetime access, and you can read it before you own a single part.
Eight files you download
- parts-list.md
- blink_bluetooth.ino
- commands.ino
- car.ino
- car_failsafe.ino
- car_autopilot.ino
- controller.html
- controller_plus.html
Five sketches, two web remotes and the parts list. Every sketch was compiled with arduino-cli before it shipped, so none of them fail on a missing semicolon.
It is a course, not a PDF
You get marked, and you can prove it
Marked the moment you answer
Five questions at the end of every lesson, then four module quizzes and a final exam, all marked by the server. Nothing waits for a human, because nothing here is marked by one.
A certificate with a real mark on it
Pass at 60, and the exam has a 50% hurdle of its own. It carries a grade — Pass, Merit or Distinction — and a link anyone can open to check it is yours.
Thirteen badges, and a workbook
For pairing the module, driving the car, fitting the fail-safe, sitting a module clean. The workbook keeps your notes, sketches, serial output and photos of the thing on your floor.
A page to send someone
Optional, and off unless you turn it on: a public profile with your badges, streak and certificate. Showing your grades is a second, separate switch.
The thirteen badges
- First PairingAn LED switched from your phone, with no wire
- Wheels on the FloorThe car drove off under its own battery
- Fail-Safe FittedThe car stops itself when the link drops
- AutopilotA car that drives itself round the furniture
- Four BoxesYou can say which box a fault is in
- Serial Without a CableCrossed lines, the divider, the baud rate
- H-BridgeDirection, PWM and the jumper caps nobody mentions
- Web RemoteThe hardest quiz in the course
- Bluetooth CertifiedThe course passed. Carries the grade band
- Clean SheetEvery module quiz at 100%, first attempt
- Full WorkbookAn entry for every required lesson
- Seven DaysSeven days in a row at the bench
- Thirty DaysThirty days in a row at the bench
Each one has a rule behind it, and the locked ones are listed too — so you can always see what the next one takes.
Before you buy
The part most pages leave out
The phone-as-a-remote part of the course needs a BLE module (HM-10) and a Chromium browser. Web Bluetooth has never shipped in Safari, on any Apple platform, and Firefox doesn’t have it either. On an iPhone you use the free Bluefy browser.
If you own an HC-05 or HC-06, the book covers you completely — that is what it was written for — but the web remote needs the other module. That is a purchase, not a fix, and it is said here rather than after your money.
The offer
Both, $9, for the first 100
- · The 62-page book, PDF, yours to keep
- · The eight-lesson build course, lifetime access
- · Eight files: five sketches, two web remotes, a parts list
- · Quizzes, a final exam, and a certificate if you pass
- · Badges, a workbook, and a public profile if you want one
- · 30-day refund, no argument, and you keep both
It is $9 because I would rather it sat on a thousand benches than fifty. After the 100th sale it becomes $24, which is closer to what a book plus a course is worth — and that is the only thing about this offer that is going to change.
Delivered by email the moment you pay.
Questions
Straight answers
- What happens after the last seat?
- The price becomes $24 and this page comes down. That is the whole mechanism: no timer, no countdown, and nothing expires while you are reading.
- Is this a discount off a price nobody ever paid?
- No. $9 is what this has cost since it went on sale. The launch price is the real price — what changes is that it goes up.
- How many are left?
- Counted by hand from the checkout, and I don't publish a running total — a number that only moves down is a pressure device, and this page doesn't use them. What is fixed: the 100th sale is the last at $9, and after it this page comes down.
- Are there reviews?
- Not yet — you would be early, and pretending otherwise is the sort of thing this book was written against. What you can check instead: read 12 pages free, and every number in the book is sourced.
- Do I need to buy hardware?
- For the book, no. For the build, yes — about $80 of parts, every one named and priced inside the course before you commit, and less if you already own an Arduino.
- What is the certificate, exactly?
- A verifiable record that you sat the questions and passed them. The mark is real — 60 to pass, and the exam carries its own 50% hurdle, so it cannot be earned by clicking through. It names your grade, and it lives at a public link anyone can open and check. Show it to someone deciding whether you can actually do this and it answers the question. It is not an accredited qualification, and no course sold for $9 is.
- Who marks it?
- A computer, the moment you answer. Every question is multiple choice or a "what does this print" — marked by comparison, not by opinion, so two people who answer the same get the same mark. Nothing sits in a queue waiting for a human to read it.
- What if it doesn’t help?
- Email me within 30 days and I will refund it. Keep the book and the course either way. There is no version of this where arguing over $9 is worth either of our time.
Want to read first? 12 pages are free, or the book on its own is the same $9 — this page is the same purchase, written for someone who wants to build the car as well as fix it.