Hardware
Last updated
Last updated
The Picoclick-C3 is - as the name suggests - based on the ESP32-C3 which is a 32-bit RISC-V processor running at up to 160MHz.
Pico size: 18x22mm
MCU: ESP32-C3FH4
Single button interface
Two APA102-2020 RGB LEDs
Embedded battery protection
Embedded battery charging with status LED
Optimized battery monitoring
Extension port with two GPIOs and power pins
Ultra low power device
Includes an onboard chip antenna
On the front side there are mainly three things only: The 12mm button, two APA102-2020 LEDs and the 6p FPC connector. Additionally there are two soldering jumpers.
The back side is the main component side. It holds the USB Type-C jack, the ESP32-C3, the battery charging as well as the battery protection circuit, a voltage regulator, the antenna with its matching network and the power latching circuit. And the best: A golden logo :)
PCB: 18mm x 20mm
Thickness: 1mm
Corner radius: 2mm
MCU
ESP32-C3FH4
Main processor, 4MB flash
Battery protection
XB6042I2SV
Battery charging
WS4518D
Charging current set to 20mA
Voltage regulator
MIC5504
3.3V LDO
LEDs
APA102-2020-256-8
RTC crystal
CM9V-T1A
32.768kHz
Main crystal
S2140000091070JY
40MHz, 2016
Antenna
SLDA31-3R400G-S1TF
2.4GHz
FPC connector
FH34SRJ-6S-0.5SH(50)
APA102 SDI (LED)
GPIO7
Output
APA102 CLK (LED)
GPIO6
Output
Button state
GPIO5
Input
Battery voltage
GPIO4
Input, includes an 1:1 voltage divider
Battery voltage trigger
GPIO3
Output
All the current consumptions below are measured with my PowerProfilerKit 2.
WiFi activated
74mA
Peaks can be up to 200mA
WiFi disabled and LEDs fading
27mA
Picoclick deactivated
2µA
The current consumption in active mode can be reduce with the following steps:
Turn WiFi only on when really needed.
Reduce CPU frequency. With the embedded clock (40MHz) you can set the frequency to 10, 20 and 40MHz. 10MHz is great for just LED applications.
Reduce APA102 LED brightness.
There are two soldering jumpers with two different functions. The BOOT and the USB jumper.
The left jumper connects the boot strapping pin of the MCU to GND and therefore forces to enter the boot mode of the ESP32. More infos are described here.
The right jumper connects the USB voltage to the battery voltage, so that the Picoclick can be powered directly over the USB port without the need of connecting another power supply. The battery charger is not in use then (of course).
NOTE!: Do not connect a battery to the Picoclick if this jumper is closed, else you would destroy the Picoclick, your battery or both of them.
