EnvOpenClock

Envious-Data·EnvOpenClock·KiCad Files LOB/Env-MicroDotClock.kicad_pcb

About the EnvOpenClock PCB

EnvOpenClock is an open source RP2040/RP2350 PCB design by Envious-Data, published on GitHub under the MIT license. It is a 2-layer board measuring 90 × 65.2 mm, with 326 components from 14 distinct parts.

Its main chip is the SI7021-A20, from the RP2040/RP2350 family. Other key parts include the IS31FL3730-QFLS2-TR and DS3231M. By type, the board carries 280 diodes, 12 resistors, 10 capacitors, 8 LEDs, 6 ICs and 6 switches.

It belongs with the displays & leds and power & battery designs in this gallery.

From the project

A fancy lil clock using LTP-305

There are 4 buttons and a switch, The switch is meant for Summer time adjustment and the 4 buttons are for setting the time or alarm.

We'd like to change this to have easier to press buttons, a larger battery holder, the speaker may not get re-implemented, we'll see when we decide to move toward finalizing the design and preparing for order. Keep in mind that TIL305s have been discontinued for a long time and LTP305s are now discontinued and hard to get so we'll substitute our own "DIY305" which is a dip14 sized PCB with standard headers and 0402 leds but we have made a 0201 version but may…

EnvOpenClock, from the project README — From the project README

Main components on the EnvOpenClock

IS31FL3730-QFLS2-TRSI7021-A20 DS3231M

EnvOpenClock bill of materials (BOM)

326 components, 14 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
4	IS31FL3730-QFLS2-TR	QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm_ThermalVias	IC1, IC2, IC3, IC4
1	SI7021-A20 Raspberry Pi Pico	RPi_Pico_SMD_TH	U1
1	DS3231M	SOIC-16W_7.5x10.3mm_P1.27mm	U3
1	2SC1815	SOT-23	Q1
1	Conn_01x06_Pin	PinHeader_1x06_P2.54mm_Vertical	J1
1	Keystone 3034	BatteryHolder_Keystone_3034_1x20mm	BT1
1	Buzzer 12.2Mm	Buzzer_TDK_PS1240P02BT_D12.2mm_H6.5mm	BZ1
6	SW_SPST	SW_Push_SPST_NO_Alps_SKRK	SW1, SW2, SW3, SW4, SW5, SW6
8	LED	LED_0402_1005Metric	DI1, DI2, DI3, DI4, DI5, DI6, DI7, DI8
280	LED	LED_0402_1005Metric	D2, D3, D4, D5, D6, D7, D8, D9 +272
5	0402 0.1uF	C_0402_1005Metric	C1, C3, C5, C7, C9
5	0402 1uF	C_0402_1005Metric	C2, C4, C6, C8, C10
10	0402 10K	R_0402_1005Metric	R1, R2, R5, R6, R7, R8, R9, R10 +2
2	0805 1K	R_0805_2012Metric	R3, R4

EnvOpenClock design files

The KiCad project lives in the Envious-Data/EnvOpenClock repository on GitHub; these links point at the commit this page was built from.

EnvOpenClock: common questions

What microcontroller does the EnvOpenClock use?

The EnvOpenClock is built around the SI7021-A20, from the RP2040/RP2350 family.

How big is the EnvOpenClock PCB?

The EnvOpenClock measures 90 × 65.2 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the EnvOpenClock?

326 components, from 14 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the EnvOpenClock design files?

From the Envious-Data/EnvOpenClock repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the EnvOpenClock design in my own project?

Yes, under the terms of its MIT license, which Envious-Data chose for the repository.

Can I test firmware for the EnvOpenClock without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.