cocoro

The idea behind this board is to function as a night light. It uses an STM8s MCU to control different characteristics such as color or brightness. The user interface consists of a rotary encoder and a small I2C OLED display, based on the SD1306 controller.

Warnings

The P Channel Mosfets (FDN340P) placement to turn on the LEDs (high side switch) is wrong. Pin assignment is wrong. For example, the PCB layout marks the source as being the gate. The part needs to be rotated 90° to the left for pins to be properly placed.

Project Files

Board

BOM

Part	Value	Description	References
C	100n	Unpolarized capacitor	['C1', 'C2', 'C4', 'C5', 'C6', 'C7']
C	1u	Unpolarized capacitor	['C3', 'C8', 'C9']
Polyfuse	MINISMDC050F-2	Resettable fuse, polymeric positive temperature coefficient	['F1']
FerriteBead	220@100MHz	Ferrite bead	['FB1']
MountingHole	MountingHole	Mounting Hole without connection	['H1', 'H2', 'H3', 'H4']
USB_B_Micro	USB_B_Micro	USB Micro Type B connector	['J1']
Conn_01x04_Pin	Conn_01x04_Pin	Generic connector, single row, 01x04, script generated	['J2', 'J3']
Conn_01x10_Pin	Conn_01x10_Pin	Generic connector, single row, 01x10, script generated	['J4']
R	5.1k	Resistor	['R1']
Varistor	V55MLA0603LNR	Voltage dependent resistor	['RV1', 'RV2']
RotaryEncoder_Switch	RotaryEncoder_Switch	Rotary encoder, dual channel, incremental quadrate outputs, with switch	['SW1']
SW_Push	SW_Push	Push button switch, generic, two pins	['SW2']
DHT11	DHT11	Temperature and humidity module	['U1']
STM8S105K6	STM8S105K6	Mainstream Access line 8-bit MCU with 32 Kbytes Flash, 16 MHz CPU, integrated EEPROM	['U2']
C	TBD	Unpolarized capacitor	['C10', 'C11', 'C12']
LED_RKGB	LED_RKGB	RGB LED, red/cathode/green/blue	['D1', 'D2', 'D3', 'D4', 'D5', 'D6', 'D7', 'D8', 'D9', 'D10', 'D11', 'D12', 'D13', 'D14', 'D15', 'D16']
PMOS	FDN340P	P-MOSFET transistor, drain/source/gate	['Q1', 'Q2', 'Q3']
R	11k	Resistor	['R2']
LED1642GWTTR	LED1642GWTTR	16-channel LED driver with error detection, current gain control and 12/16 bit PWM brightness control, TSSOP-24	['U3']