2 layers139 × 190 mm
Programmable precision resistor
sbstnh/programmable_precision_resistor
A SCPI programmable precision resistor
253 parts65BSD-3-Clause
2 layers
Clock 7 4x1
serhiyk/avr_projects1Arduino + DS3231 + 12 x MAX7219
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 57
- Nets
- 72
- Pads
- 228
- Tracks, vias
- 618, 18
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 27 Jan 2015
- Updated
- 6 Jul 2025
Overview
Clock 7 4x1 is an open-source printed circuit board by serhiyk, from the serhiyk/avr_projects repository on GitHub. It is a 2-layer board with 57 parts on 72 nets, routed with 618 tracks and 18 vias.
It is built around the ATMEGA8A-AU, STP16CP05T and SS16. Its parts include 13 capacitors, 10 resistors, 4 ICs, 2 diodes and 2 transistors. It belongs with the lEDs and displays boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
3
ATMEGA8A-AU
TQFP-32(7x7)-40℃~+85℃ 10bit 16MHz 1KB 2.7V~5.5V 23 512Byte 8 Bit 8KB AVR Built-in FLASH TQFP-32(7x7) Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
STP16CP05T
TSSOP-24-40℃~+125℃ 100mA 16 20V 30MHz 3V~5.5V 5% Analog、PWM Built-in TSSOP-24 LED Drivers ROHSSTMicroelectronicsLED Drivers
SS16
SMA(DO-214AC)-55℃~+150℃ 100uA@60V 1A 60V 700mV@1A Independent SMA(DO-214AC) Schottky Diodes ROHSFUXINSEMISchottky Diodes
README
README.mdArduino clock
Component list
- Arduino pro mini
- Display modules based on MAX7219 (6x2)
- RTC based on DS3231
- PIR sensor (optional)
- Light sensor (optional)
Compiling the source
I've tested the compiling process only on Ubuntu 14.04
Install the required software:
sudo apt-get install gcc-avr
sudo apt-get install avr-libc
sudo apt-get install avrdude
Compile the source:
cd src/clock_6x2/
make all
Upload FW to the device:
sudo make upload
Parts
57| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10.0 | Capacitor_SMD:C_1210_3225Metric | C6, C7, C8, C9, C10 |
| 4 | 0.1 | Capacitor_SMD:C_0805_2012Metric | C2, C4, C11, C12 |
| 4 | 7SEGMENTS | display:AFF_S2306 | AFF1, AFF2, AFF3, AFF4 |
| 3 | 1k | Resistor_SMD:R_0805_2012Metric | R6, R7, R8 |
| 2 | 10k | Resistor_SMD:R_0805_2012Metric | R1, R4 |
| 2 | 12 | Capacitor_SMD:C_0805_2012Metric | C1, C3 |
| 2 | 2k2 | Resistor_SMD:R_0805_2012Metric | R9, R10 |
| 2 | IRF7403 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | Q1, Q2 |
| 2 | STP16CP05 | Package_SO:SO-24_5.3x15mm_P1.27mm | U3, U4 |
| 1 | + | TestPoint:TestPoint_Pad_4.0x4.0mm | TP1 |
| 1 | - | TestPoint:TestPoint_Pad_4.0x4.0mm | TP2 |
| 1 | 1.0 | Capacitor_SMD:C_0805_2012Metric | C5 |
| 1 | 1F | Battery:BatteryHolder_ComfortableElectronic_CH273-2450_1x2450 | C13 |
| 1 | 32768 | Crystal:Crystal_AT310_D3.0mm_L10.0mm_Horizontal | Y1 |
| 1 | 470 | Resistor_SMD:R_0805_2012Metric | R2 |
| 1 | 47k | Resistor_SMD:R_0805_2012Metric | R3 |
| 1 | 4k7 | Resistor_SMD:R_0805_2012Metric | R5 |
| 1 | ATmega8A-A | Package_QFP:TQFP-32_7x7mm_P0.8mm | U2 |
| 1 | AVR-ISP-6 | Connector_IDC:IDC-Header_2x03_P2.54mm_Vertical | J1 |
| 1 | Buzzer | Buzzer_Beeper:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | D | Diode_THT:D_DO-15_P15.24mm_Horizontal | D1 |
| 1 | GND | TestPoint:TestPoint_Pad_4.0x4.0mm | TP17 |
| 1 | In+ | TestPoint:TestPoint_Pad_4.0x4.0mm | TP7 |
| 1 | In- | TestPoint:TestPoint_Pad_4.0x4.0mm | TP9 |
| 1 | LM78M05_TO252 | Package_TO_SOT_SMD:TO-252-2 | U1 |
| 1 | Out+ | TestPoint:TestPoint_Pad_4.0x4.0mm | TP8 |
| 1 | Out- | TestPoint:TestPoint_Pad_4.0x4.0mm | TP10 |
| 1 | RX | TestPoint:TestPoint_Pad_4.0x4.0mm | TP15 |
| 1 | S+ | TestPoint:TestPoint_Pad_4.0x4.0mm | TP5 |
| 1 | S- | TestPoint:TestPoint_Pad_4.0x4.0mm | TP6 |
| 1 | SCL | TestPoint:TestPoint_Pad_4.0x4.0mm | TP4 |
| 1 | SDA | TestPoint:TestPoint_Pad_4.0x4.0mm | TP3 |
| 1 | SS16 | Diode_SMD:D_SMA_Handsoldering | D2 |
| 1 | SW_1 | button:SW_1 | SW1 |
| 1 | SW_2 | button:SW_1 | SW2 |
| 1 | TX | TestPoint:TestPoint_Pad_4.0x4.0mm | TP16 |
| 1 | U+ | TestPoint:TestPoint_Pad_4.0x4.0mm | TP12 |
| 1 | U- | TestPoint:TestPoint_Pad_4.0x4.0mm | TP13 |
| 1 | U2- | TestPoint:TestPoint_Pad_4.0x4.0mm | TP14 |
| 1 | URX | TestPoint:TestPoint_Pad_4.0x4.0mm | TP11 |
Questions
What parts does the Clock 7 4x1 use?
57 parts, built around the ATMEGA8A-AU, STP16CP05T and SS16. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Clock 7 4x1 KiCad files?
From the serhiyk/avr_projects repository on GitHub, at the commit this page was made from: the board is kicad/clock_7_4x1/clock_7_4x1.kicad_pcb and its schematic kicad/clock_7_4x1/clock_7_4x1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Clock 7 4x1 design in my own project?
Its repository states no licence, so its author keeps all rights: ask serhiyk before reusing the design.
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