Monitor I/O Lines - Digi XBee 3802.15.4 User Manual

I/O support
Function Micro Pin
PWM0 7
PWM1 8
AV (Analog Voltage Reference)
sample data is represented as a 2-byte value. For a 10-bit ADC, the acceptable range is from 0x0000
to 0x03FF. To convert this value to a useful voltage level, apply the following formula:
ADC / 1023 (vREF) = Voltage
Note ADCs sampled through MicroPython will have 12-bit resolution.
Example
An ADC value received is 0x01AE; to convert this into a voltage the hexadecimal value is first converted
to decimal (0x01AE = 430). Using the default AV reference of 1.25 V, apply the formula as follows:
430 / 1023 (1.25 V) = 525 mV

Monitor I/O lines

You can monitor pins you configure as digital input, digital output, or analog input and generate I/O
sample data. If you do not define inputs or outputs, no sample data is generated.
Typically, I/O samples are generated by configuring the device to sample I/O pins periodically (based
on a timer) or when a change is detected on one or more digital pins. These samples are always sent
over the air to the destination address specified with
(Destination Address
You can also gather sample data using on-demand sampling, which allows you to interrogate the state
of the device's I/O pins by issuing an AT command. You can do this on either a local or remote
device via an AT command request.
The three methods to generate sample data are:
Periodic sample
n
Periodic sampling based on a timer
l
Samples are taken immediately upon wake (excluding pin sleep)
l
Sample data is sent to DH+DL destination address
l
Can be used with line passing
l
Requires API mode on receiver
l
Change detect
n
Samples are generated when the state of specified digital input pin(s) change
l
Sample data is sent to DH+DL destination address
l
Can be used with line passing
l
Requires API mode on receiver
l
Digi XBee® 3 802.15.4 RF Module User Guide
SMT Pin TH Pin
7 6
8 7
specifies the analog reference voltage used for the 10-bit ADCs. Analog
Low).
(IR (Sample Rate))
(IC (DIO Change Detect))
AT Command
P0 (DIO10/RSSI/PWM0 Configuration)
P1 (DIO11/PWM1 Configuration)
DH (Destination Address High) and DL
Monitor I/O lines
92