BLK IO

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Control Commands

  • Pin Definition
  • All pins connect to ground pin of LED
  • All commands should be end up with \r\n
Pin MCU PIN v1.1 Command v1.0 Command Note
1 PB5 1N - 1F N1 - F1
2 PB4 2N - 2F N2 - F2
3 PC3 3N - 3F N3 - F3
4 PC4 4N - 4F N4 - F4
5 PC5 5N - 5F N5 - F5
6 PC6 6N - 6F N6 - F6
7 PC7 7N - 7F N7 - F7
8 PD3 8N - 8F N8 - F8 Also connected to Bluetooth status LED pin (1)
9 PD2 9N - 9F N9 - F9
0 PD4 0N - 0F N0 - F0
A PA1 AN - AF NA - FA
B PA2 BN - BF NB - FB
C PA3 CN - CF NC - FC
  1. When Bluetooth made connection, BT status LED will keep constant high, you can not write it low, notice. But you can read the BT status via this pin.

Serial Debugging

Bluetooth connect to serial debugger

  • board TX to cable RX, board RX to cable TX:
Receive Action Send from example
Serial monitor only response < Phone CMD "N1"
Serial monitor NOT response < Serial monitor CMD "N1"
Phone get < MCU feedback "you sent the message is ..."
Serial monitor NOT get < MCU feedback "you sent the message is ..."

MCU connect to serial debugger

  • vice verse connection
Receive Action Send from example
Serial monitor response < Serial monitor CMD "N1"
Serial monitor NOT response < Phone CMD "N1"
Phone get < MCU feedback "you sent the message is ..."
Serial monitor get < MCU feedback "you sent the message is ..."

Control APP

Recommanded android SPP APP:

  • BlueSPP - support to use as "switch" or "button"
  • Bluetooth SPP Pro
  • Bluetooth Serial Terminal
  • etc