99 lines
2.5 KiB
Markdown
99 lines
2.5 KiB
Markdown
# Raspi
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The Raspberry Pi is an inexpensive and popular ARM based single board computer with digital & PWM GPIO, and i2c interfaces built in.
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The Raspberry Pi is a credit-card-sized single-board computer developed in the UK by the Raspberry Pi Foundation with the intention of promoting the teaching of basic computer science in schools
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For more info about the Raspberry Pi platform, click [here](http://www.raspberrypi.org/).
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## How to Install
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First you must install the appropriate Go packages
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```
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go get -d -u github.com/hybridgroup/gobot/... && go install github.com/hybridgroup/gobot/platforms/raspi
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```
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### Enabling PWM output on GPIO pins.
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You need to install and have pi-blaster running in the raspberry-pi, you can follow the instructions for pi-blaster install in the pi-blaster repo here:
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[https://github.com/sarfata/pi-blaster](https://github.com/sarfata/pi-blaster)
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### Special note for Raspian Wheezy users
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The go vesion installed from the default package repositories is very old and will not compile gobot. You can install go 1.4 as follows:
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```bash
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$ wget -O - http://dave.cheney.net/paste/go1.4.linux-arm~multiarch-armv6-1.tar.gz|sudo tar -xzC /usr/local -f -
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$ echo '# Setup for golang' |sudo tee /etc/profile.d/golang.sh
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$ echo 'PATH=$PATH:/usr/local/go/bin'|sudo tee -a /etc/profile.d/golang.sh
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$ source /etc/profile.d/golang.sh
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```
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#### Cross compiling for the Raspberry Pi
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You must first configure your Go environment for linux cross compiling
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```bash
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$ cd $GOROOT/src
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$ GOOS=linux GOARCH=arm ./make.bash --no-clean
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```
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Then compile your Gobot program with
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```bash
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$ GOARM=6 GOARCH=arm GOOS=linux examples/raspi_blink.go
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```
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Then you can simply upload your program over the network from your host computer to the Raspi
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```bash
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$ scp raspi_blink pi@192.168.1.xxx:/home/pi/
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```
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and execute it on your Raspberry Pi with
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```bash
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$ ./raspi_blink
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```
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## How to Use
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```go
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package main
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import (
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"time"
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"github.com/hybridgroup/gobot"
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"github.com/hybridgroup/gobot/platforms/gpio"
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"github.com/hybridgroup/gobot/platforms/raspi"
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)
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func main() {
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gbot := gobot.NewGobot()
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r := raspi.NewRaspiAdaptor("raspi")
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led := gpio.NewLedDriver(r, "led", "7")
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work := func() {
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gobot.Every(1*time.Second, func() {
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led.Toggle()
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})
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}
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robot := gobot.NewRobot("blinkBot",
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[]gobot.Connection{r},
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[]gobot.Device{led},
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work,
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)
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gbot.AddRobot(robot)
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gbot.Start()
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}
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```
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