Raspberry Pi + 2x Arduino Nano V3.0

March 19, 2014 by
Filed under: Development, General, Hardware, Linux, Robots 

Quick update, during my evenings I’ve been working with one of the Raspberry Pi’s I won on a local contest a few months ago, and it’s generally derailed into some kind of “let’s put as much stuff on it as possible”, meaning that I currently got my Raspberry Pi hooked up with:

  • Slice of Pi
  • Adafruit PWM driver
  • Raspicam on a simple pitch/yaw servo gimbal that me and my 1,5 year old put together in 10 minutes. Controlled via PWM.
  • MPU9150 sparkfun breakout board
  • 2 Arduino Nano V3.0

The two Arduino Nanos have split functionality, where one will provide me with data that needs to be gathered frequently, and the other is used for slow processes such as reading out 1-wire temp sensors etc.

The first nano will have the following functions hooked up to it:

  • 3x HC-SR04 ultrasound distance sensors
  • Voltage measurement 0-20V circuit
  • Control of 2 relays
  • 3x line tracking sensors
  • Reed switch
  • 2x motor controls via L298P chip

The second nano has the following hooked up to it:

  • MPX2200GP pressure sensor (will use something else soon’ish)
  • 2x 1-wire DS18B20 temperature sensors.
  • Others?

The general idea was to move timing critical stuff off the raspberry to the Nano and let the first one deal with quick sensor readouts, while the second Nano is dropped off with relatively slow sensors (DS18B20 takes very long time to read out for example). The two nanos will talk to the Raspberry via SPI I think, or possibly serial ports, but this is less likely as it would either require me to use one USB serial driver and the raspberry UART or get a 2 port USB hub of some kind and talk via USB UART’s.

arduino-hookup

I’ve meanwhile also played around with Eagle CAD for the first time in my life, making some electrical drawings of the hookups. I’m considering making a PCB layout of everything when I get there, not sure if there is any interest in this out there except for “the lols”. The image is still very raw and missing a lot of stuff that I know needs to be added at some point.

During christmas I spent some time making opencv haar cascade training on clementine detection and generally fooling around with it. I think I’m leaning towards making a robot (chassi on the way) which will travel around in the room looking for objects… I guess some of the sensors are a little overboard for this, but it’s all fun and games while it’s not work… 😉

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