Tag - OpenCyclingComputer

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Friday, March 31 2017

Open Cycling Computer will be Pi Zero W based

Pi Zero W is the new brain of the Open Cycling Computer. PiTFT 2.8" capacitive dosn't work out-of-the-box, but required modification are very simple.Modifications required in /boot/config.txt1. Uncomment dtparam=spi=on2. Add  […]

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Sunday, February 8 2015

Bluetooth BLE, gatttool and (almost) all those numbers .... explained

It's a short guide to practical side of bluetooth LE using gatttool. How to read characteristics, turn on notifications and where to find more info about all those BLE numbers. I was strugging for a while to read data from a BLE heart rate strap. It was working flawlessly with android apps, but I  […]

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Sunday, December 7 2014

Python library for Raspberry PI for Ultimate GPS based on MTK3339 with serial interface as sold by Adafruit

https://github.com/PrzemoF/mtk3339 Python library for Raspberry PI for Ultimate GPS based on MTK3339 with serial interface as sold by Adafruit. The library helps to set different chip parameters in a sane way. Currently supports minimum functional set of commands: CMD_HOT_START - hot_start()  […]

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Wednesday, November 12 2014

Battery backup for Adafruit Ultimate GPS Breakout - 66 channel w/10 Hz updates - Version 3

I was testing that [1] gps chip for a last few weeks - it was great, but it was preforming "cold start" every time it was turned on. Today I finally soldiered the battery holder and slided a CR1220 battery in. If you're using the same board without the battery get one immediately. Time to  […]

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Wednesday, October 15 2014

PiTFT capacitive calibration for vertical layout

pointercal_equation.png

PiTFT capacitive doesn't require calibration according to Adafruit, but for some reason I couldn't make it work properly with vertical layout and the default values suggsted here [1]. The default values are: 320 65536 0 -65536 0 15728640 65536 I needed to use the screen with Adafruit logo at the  […]

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Friday, August 22 2014

Bosch BMP183 with SPI by Adafruit in python on Raspberry PI

rpi_a_and_bmp183.jpg

How to measure temperature and pressure with raspberry pi and BMP183 Requirements: - raspberry Pi - BMP183 with SPI by Adafruit - 6 wire female-to-female cable or any other to connect 6 pins between RPI and BMP183 Results: Temperature: 18.9 deg C Pressure: 1013.39 hPa RPI + BMP183: Schematic (png):  […]

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