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→UART connector
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=== Digital connectors ===
The CANSAT-BASE is fitted with 2 Grove connector each exposing two digital line. Such line is either HIGH (3.3V) or LOW (0V).
Each line can be configured as:
* '''Input''' where an external device set the PIN voltage to 3.3V or 0V allowing the '''microcontroler to read''' the state HIGH or LOW.
* '''Output''' allowing the '''microcontroler to write (set)''' the state of the Pin to control an external device (like a LED or a Motor).
{{ambox | text = Each of the lines can also be driven with [https://en.wikipedia.org/wiki/Pulse-width_modulation Pulse-Width Modulation].}}
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{{asm-text}} Two GPIOs are attached to the Digital 1 connector.
Note the 'gp18' on the silkscreen next to the connector. The next GPIO is set to the following number.
{| class="wikitable" border="1"
|-
| align="center" | '''GPIO'''
| align="center" | '''Description'''
|- style="font-size: 90%"
| align="left" | gp18
| align="left" | Input/Output or PWM
|- style="font-size: 90%"
| align="left" | gp19
| align="left" | Input/Output or PWM
|}
{{asm-row|img=ENG-CANSAT-V2-Digital2.jpg}}
{{asm-text}} Two other GPIOs are attached to the '''Digital 2''' connector.
{| class="wikitable" border="1"
|-
| align="center" | '''GPIO'''
| align="center" | '''Description'''
|- style="font-size: 90%"
| align="left" | gp20
| align="left" | Input/Output or PWM
|- style="font-size: 90%"
| align="left" | gp21
| align="left" | Input/Output or PWM
|}
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=== UART connector ===
=== UART connector ===
The UART is often called serial line, it is a bidirectional communication bus used to communicate with an UART device. Most common device are GPS, Mobile Phone Chips, WiFi/Bluetooth chips.
The UART is often called serial line, it is a bidirectional communication bus used to communicate with an UART device. Most common device are GPS, Mobile Phone Chips, WiFi/Bluetooth chips.
A common configuration is 9600 bauds, 8 bits Data, NO parity, 1 stop bit usually summarize as "9600 8N1". The next most common configuration is "115200 8N1".
A common configuration is 9600 bauds, 8 bits Data, NO parity, 1 stop bit usually summarize as "9600 8N1". The next most common configuration is "115200 8N1".
When a device sends data, the uart will decompose the data into a sequence of bits (sequence of 1 and 0) THEN emit the bits one by one over the serial line.
When a device sends data, the sender UART will decompose the data into a sequence of bits (sequence of 1 and 0) THEN emit the bits one by one over the serial line.
As the both devices agreed on the communication parameter, the receiver can properly interpret the bits sequences TO recompose the original data.
As the both devices agreed on the communication parameter, the receiver UART can properly interpret the bits sequences TO recompose the original data.
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