ADXL345 accelerometer
The postman delivered a new toy this week. I bought an ADXL345 accelerometer on Ebay, I was a little bit surprised when the package arrived, the board came in an envelope but I couldn’t feel if there was something inside, after opening the envelope and holding it up a little black bag fell out. Inside it was the ADXL345 board, I was expecting it to be a little bit bigger. It’s very tiny and it doesn’t have any pins or terminals on it to connect it to an Arduino. So I ordered some PCB pin headers on Ebay to put on the little board, so I can easily hook it up to my Arduino Uno or Mega. The ADXL345 can be read over the I2C or SPI bus. I’ll be using it on the I2C bus, as it is an 3,3V device I will need to use some resistors to pull the standard 5V I2C bus of the Arduino Uno or Mega 2560 down to 3,3V. These little chips are quite sensitive, putting 5V on it will kill it. I’m going to use it in a diy rc car/robot that I plan to built in the near future.