small updates:
1. The Grove - SPDT Relay(30A) - uses +5V. So for each groove socket used,
you need to solder the third pin, to disconnect it from the board, and
connect it to the input 5v power. +5V is at P9_7 or P9_8.
> The groove connector pinout are:
>
> J4 marked as I2C
> 1- I2C2_SCL - P9_19
> 2- I2C2_SDA - P9_20
> 3- VDD 3.3
> 4- GND
>
> J5 - marked as UART
> 1- UART2_RXD - P9_22
> 2- UART2_TXD - P9_21
> 3- VDD 3.3
> 4- GND
>
> The pinout of the relay is:
> 1- Signal
> 2- not connected
> 3- +5V
> 4- GND
>
> If you connect the relay to J4 use this python code, to toggle it on and
> off
>
> import Adafruit_BBIO.GPIO as GPIO
> import time
> GPIO.setup("P9_19", GPIO.OUT)
> while True:
> GPIO.output("P9_19", GPIO.HIGH)
> time.sleep(0.5)
> GPIO.output("P9_19", GPIO.LOW)
> time.sleep(0.5)
>
>
> The relay kit from seeed, has a buffer transistor and a protection diode.
> So if you use +5V the relay will turn on.
>
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