blonkenclick

a blinken clock.

a beginner's solder kit with a fancy RGB 16 segment display (6 digits wide), a realtime clock, a temperature sensor around an ESP32 microprocessor running micropython.

As a display it uses our digitus16 16 segment display.

Parts List

quantity	symbol	description	notes
1	-	PCB	the rectangular black blonkenclick PCB
1	R1	LDR	light dependent resistor, white ceramic, red wiggly lines
1	R2	10 kOhm resistor	we may want to reduce the val once we see a real 5528
1	U2	RTC module	here your time is kept even when unplugged, running from the CR2032
1	U1	ESP32 C3 super mini	small processor board with red "C3" labelled antenna and USB-C
1	-	DS18B20 temp sens	DS18B20 1-wire digital temperature sensor
1	-	digitus16 6 digits	6 digits 16-segment RGB display
1	-	CR2032 battery	for the RTC module
enough	-	pins	for mounting all modules and the optional UART header

Hardware

KiCAD schematic board design

you find the design in the hardware/ folder. there's also the schematic PDF.

each pin explained

we want you to learn.

and in turn be creative with your new device.

so that some of your questions you might have get already answered here we describe each pin of the contraption. some are not even used or required for the blonkenclick, we'll still explain them anyway. of course you are free to be creative with your new hardware and modify by soldering more sensors or actors to it, or just change it through it's python software, or run C++ or Rust or Assembly on the device. the hardware comes with WiFi and BT capabilities, but those still lay unused in your blonkenclick.

oh, and there's a maybe useful 4kBytes 24C32 EEPROM on the RTC module at i2c 0x50. store all your encypted secrets here.

Name	Source	Sink	Description/Usage
USB-C	sun	ESP32	power supply from your PC, powerbank, or PSU. can also be used to upload new firmware or debug
5	USB-C	ESP32, EEP, digitus16, DS1307	main 5V power supply for most sub-components, from USB-C
G	GND		most electronic circuits have one (lowest) reference voltage/potential called ground. this is it.
3	ESP32	LDR voltage divider	for in/external use the ESP32 creates a 3.3V from the main 5V
CK	ESP32	digitus16	SPI clock, often called SCK or CO, here used to control the protocol with the addressable LEDs in digitus16
Bt	CR2032	ESP32	to keep time without ext power, the RTC needs a battery, here the ESP can monitor the CR2032 bat voltage through one of its ADC channels
NC2	ESP32	ESP32	ESP32's GPIO2, not used in the design (NC=not connected), free for your hacks
QS	RTC	ESP32	the RTC can provide a 1Hz (or 4/8/32kHz) clock, currently unused in SW, but might be interesing for your low power design driven by a 1Hz ISR
LDR	light dep voltage	ESP32	LDR5528's voltage divider tells us the ambient light situation through ADC0, we dim the display accordingly
Rx	your PC	ESP32	optional secondary serial terminal connection to anything, currently unused in SW, but has a nice optional pin header J1
Tx	ESP32	your PC	optional secondary serial terminal connection to anything, currently unused in SW, but has a nice optional pin header J1
DS	DS18B20	ESP32	1-wire digital thermometer input pin from the DS18B20 sensor, following the onewire protocol
SCL	ESP32	RTC/EEP	i2c clock, ESP32 is master
SDA	ESP32/RTC/EEP	ESP32/RTC/EEP	bidirectional i2c data, ESP32 is master, RTC at 0x68, EEPROM at 0x50
NC7			ESP32's GPIO7, not used in the design (NC=not connected), free for your hacks
DO	ESP32	digitus16	SPI data, often called MOSI or DO, here used to talk the SPI protocol with the addressable LEDs in digitus16
DI/NC	ESP32	ESP32	ESP32's GPIO5, not used in the design (NC=not connected), free for your hacks

Assembly

there's the assembly guide (english) in the doc/ folder

TL;DR: assemble the PCB by going through the Parts List top to bottom.

License

licensed under the CERN Open Hardware Licence Version 2 - Strongly Reciprocal

see LICENSE.txt for details.