Extension Port

Compared to the other Picoclicks the C3 has the huge benefit that it contains an FPC extension port on the device. It leads out useful pins which can interact with other devices. Even I2C devices can be connected. If I2C sensors are interrupt capable, the Picoclick can be activated through these.

Moreover the Picoclick can be powered over this extension port with an external power supply between 3.6V and 6V.

Breakout board

With the help of this little breakout board it is easy to prototype your own projects on a breadboard.

Pinout

The Picoclick-C3 leads out the following signals. Following image shows the pinout for the breakout board, but the order is the same on the Picoclick when connecting both like shown in the upper image.

Pin	Function	Description
1	Button	Button activation signal. Supply a voltage between 3V3 and VBAT for a short period to activate the Picoclick. Behaves like a button press.
2	GPIO2	Pulled up GPIO of the ESP32-C3. This is a strapping pin which need to be HIGH during boot. Can be used for I2C.
3	GPIO8	Pulled up GPIO of the ESP32-C3. This is a strapping pin which need to be HIGH during boot. Can be used for I2C.
4	+VBAT	Battery voltage. Always present, even if the device is not activated. Powering external devices with this voltage reduces battery lifetime.
5	GND	Ground.
6	+3V3	Switched 3.3V line. Only present if the Picoclick is activated.

Button activation

The button activation line can be used to externally activate the Picoclick. Therefore a connection between the BUTTON and the +VBAT line has to be established like shown in the following image.

The state of this line can be read out by the processor. It is the same signal used by the embedded button on the device. So that line is not only for activating the Picoclick.

Using I2C

Both external GPIOs are strapping pins of the ESP32-C3 and thus are pulled up on the Picoclick itself (they don't need external I2C pull-ups). If you wanna hook up an I2C device which should be turned off during the idle period you can simply use the +3V3 as a power source. In the other case the +VBAT signal can be used with an external voltage regulator. Latter can be useful if you have an I2C device which activates the Picoclick by firing an interrupt.

Function	GPIO
SDA	GPIO2
SCL	GPIO8