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ble-io bluetooth service

bada5555-e91f-1337-a49b-8675309fb099 IO service

This is the main service that IO Characteristics belong to. All bytes in the document are represented by arrays of values 0 to 255.

2a56 Digital Characteristic

This characteristic is for reading and writing digital values to pins.

To turn on pin 13: write [13, 1]

To turn off pin 13: write [13, 0]

You may also write in pairs of bytes at once to change multiple pins. To turn on pin 12, turn off pin 9, and turn on pin 3 all at once: write [12, 1, 9, 0, 3, 1]

Subscribe for notifications to this characteristic for changes in value. a notify of [9, 1] means that pin 9 has been turned on.

2a58 Analog Characteristic

This characteristic is for reading and writing analog values to pins. Analog values come in at values 0-1023 and must be split across 2 bytes with Least Significant Bits first: LSB(bits 0-7) followed by the Most Significant Bits: MSB(bits 8-15). However, simple 8-bit analog PWM writes do not need an MSB byte sent.

To write the PWM value 227 to pin 3 write [3, 227]

To write a 10-bit value such as 613 to pin 11 you must issue three bytes (pin, LSB, MSB) write [11, 101, 2]

You may also write to multiple pins at once, however you will need to always do them in sets of 3 bytes (pin, LSB, MSB). To set PWM values of pin 3 to 255 and pin 11 at 127 write [3, 255, 0, 11, 127, 0]

Subscribe for notifications to this characteristic for changes in analog values. These will always come back as (pin, LSB, MSB) a notify of [15, 202, 2] means that pin 15's analog reading is 714.

2a59 Config Characteristic

This characteristic is used to configure the BLE peripheral's pins.

SET_PIN_MODE 244:

The current supported pin modes are:

  • INPUT: 0
  • OUTPUT: 1
  • ANALOG: 2
  • PWM: 3
  • SERVO: 4

To set pin 3 to SERVO mode: write [244, 3, 4]

REPORT_ANALOG 192:

To turn on analog reporting for pin 14: write [192, 14, 1]

To turn off analog reporting for pin 14: write [192, 14, 0]

REPORT_DIGITAL 208:

To turn on digital reporting for pin 7: write [208, 7, 1]

To turn off digital reporting for pin 7: write [208, 7, 0]

SAMPLING_INTERVAL 122:

To set the sampling interval to 150 milliseconds: write [122, 150]

To set the sampling interval to 715 milliseconds you'll need LSB and MSB bytes: write [122, 203, 2]

SERVO_CONFIG 112:

To set min and maxes on a servo, you'll need to issue both min and max values as LSB and MSB bytes.

To set the min to 0 and max to 180 on pin 3: write [112, 3, 0, 0, 180, 0]