Notepad of a tinker, maker, hacker or whatever you call it :)

16 posts under
Embedded electronics

(Not so) industrial reflow process

I wanted to try if a 100% DIY process to reflow a small batch of boards. For about 10 boards it is cheaper to hand solder them than ordering a stencil, but I was wondering if it can be faster to manually cut a stencil and reflow the boards on a frying pan. Stencil...

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Use Sigfox, Arduino (Akeru), PHP and callbacks

A friend of mine asked me for some help on an Akeru device, it is an Arduino + Sigfox modem. After few tinkering we succeed to do what he wanted and share it : gather some sensors data and collect it in a PHP webpage. The Arduino code is quite easy thanks to the Akeru library...

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The Wipy - Wifi selection at startup

I recently bought the Wipy development board to try Python (a friend of mine is a big fan), and will have a TI CC3200 (ARM Cortex-M4+wifi) development board even if I prefer develop in C. Here is just a snippet allowing to ground or set to 3.3V GP4 in order to connect...

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Some fun with an accelerometer

I recently discussed with some friends about sensors to record jumps height and hang time when kitesurfing, which are really expensive and need to wear a phone in a waterproof case. As it is a useless sensor and just to have some fun, I wanted to try with a cheap sensor, an µC and...

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NoteRF - Add a new sensor - Moisture sensor

As I like plants but always forgot to water them, I bought a cheap resistive moisture sensor. In facts it is just two strips of copper wired in voltage divider with a 10k resistor, the IC is used as a comparator to have a "digital" output, with threshold set by the trimpot....

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NoteRF - Why create a new set of things ?

I had a discussion with a friend of mine on "Why the hell are you designing a new PCB instead of buying one" ? And he is right, there is a lot of great cheap boars like Moteino, Anarduino, Jeenode... But on the hardware side: I like to learn Some of them are...

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NoteRF - Some code

As a part of my future home automation called NoteRF, I need some devices other than a Raspberry Pi grabbing weather and pollution data from the internet. I designed a PCB and throw some lines of code on it. Currently, the devices are only sensors, but I plan to implement some actuators latter. Everything...

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Arduino - SoftwareSerial library and interrupts

I wanted to use sleep functions of the ATMega (in power down mode), and the Arduino's software serial library: it turns out that all interrupt vectors are enabled in sleep mode. So the workaround is to start the serial communication when needed with softSerial.begin( BAUD_RATE)), then stop it with softSerial.end(). Also,...

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