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Update README with some clarifications

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joeycastillo 2021-08-25 23:50:51 -06:00 committed by GitHub
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README.md
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@ -9,7 +9,7 @@ Features:
* ARM Cortex M0+ microcontroller
* 32KHz crystal for real-time clock with alarm function
* Ten digit segment LCD, plus five indicator segments
* Three interrupt capable buttons (one can wake from backup mode)
* Three interrupt capable buttons
* Red / green PWM’able LED backlight
* Optional piezo buzzer (requires some light soldering)
* On-board USB Micro B connector
@ -18,16 +18,18 @@ Features:
![image](/images/sensor-board.png)
You may have noticed that there are no sensors on this board. That is by design: rather than pick sensors for you, the goal is to add a tiny flexible PCB with the sensors YOU want, and interface them over the nine-pin connector. In addition to providing ~3V power and ground, the connector provides the following options for connectivity:
You may have noticed that there are no sensors on this board. That is by design: rather than pick sensors for you, the goal is to add a tiny flexible PCB with the sensors YOU want, and interface them over the nine-pin connector. The connector provides the following options for power and connectivity:
* An I2C interface with built-in pull-ups
* 3V power (nominal voltage from a CR2016 coin cell, can drop to ~2.7V)
* An I²C interface with built-in pull-up resistors
* Five general purpose IO pins, which can be configured as:
* Three analog inputs and two digital IO
* An SPI device + one analog / GPIO pin
* One UART + 3 GPIO
* Five digital IO pins
* Four PWM pins on two independent TC channels
* Five interrupt pins (two can wake from backup mode)
* Five analog inputs
* Five interrupt-capable digital inputs, with internal pull-up or pull-down resistors
* Five digital outputs
* SPI controller (with one spare analog / GPIO pin leftover)
* One UART TX/RX pair (with three GPIO leftover)
* Up to four PWM pins on two independent TC instances
* Two external wake inputs that can wake from the ultra-low-power BACKUP mode
![image](/images/sensor-board-pinout.png)