Getting started with the Sigfox API & php/json

This is, two files written to get data from SigFox backend, one to get message list, and other one to get the device type, it’s can be a good start for your application if you are not familiar with php and json, just edit the file, put your informations, and upload to your server. Data from backend are collected through curl and GET method, stored in a json file (be careful with security permissions) and decoded with json_decode function.

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Playing around SigFox network with Akeru board

Last week, I had the chance to attend the SigFox maker’s tour in Paris, it was very interesting to learn more about this amazing technology.

SIGFOX is the first and only company providing global cellular connectivity for the Internet of Things, fully dedicated to low-throughput communications. SIGFOX is re-inventing connectivity by radically lowering prices and energy consumption for connected devices.

After the event, everyone has got a Akeru Sigfox board with one year contract, (ready to send messages to the SigFox network), the board is available in snootlab website for 100€ and is compatible with Arduino,

829-2775credit: snootlab

I ‘m currently do some experimentation with this board, more infos soon.

Teensy GPS Logger redesigned in smaller version

The last and final design, the Teensy and GPS is directly powered from 3.7v li-on batt, 39g heights with IP4 box.

Original project:
Arduino code and pcb layout (ARES) available.
Load the sketch with CPU Speed 8Mhz under Arduino IDE, (i use v1.6.3 without any problems).

Autonomy test:
With a full batt charge, GPS locked, 5hz rate logging, 20 hours continues logging.

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Geiger counter with SBM20 tube

I “rebuild” my Geiger counter, the SBM-20 tube was initially inside the box, so, i have put this one inside a 32mm diam plastic tube, for more convenience, wired through a XLR3 cable.

The LCD display alternatively, the “count per minutes” and result on: milli Sievert/year or nano Sievert/hour, you can switch off/on the buzzer, also 3 modes on measure are available, 15/30/120 secs.

This counter is from “Electronique-Pratique” n°368, a French electronic magazine. Shem, pcb, and PIC hex & C source code available. (Microchip compiler C18 v2.40/MPLAB 8.4)


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Digital RF Milliwattmeter DC to 500 Mhz – 1W

I have just finished my OZ2CPu wattmeter,

The uncalibrated signal response is: +1/-1 dB from 1MHz to 450MHz. Input SWR will varry from 1.00 to 1.30, depending on input frequency. To make the SWR good, you need to assemble the input circuit correct and adjust the capacitor.
Input power range: -60 to +30dBm that is 1 nW to 1 Watt.
This instrument can be used and calibrated from 1 kHz and up to 500 MHz. It is possible to measure power relative all the way up to 900Mhz. A software routine can calibrate the 0dBm point at 5 different frequencies to make this instrument accurate within 0.5dBm !! The calibration data is stored in EEPROM so the instrument will remember all, also without power.
At frequencies above 300Mhz this instrument should not exceed inputs over +20dBm (100mW) to keep the good accuacy.