# Energy Meter Reference Design ## Description This is an Energy Meter project leveraging an ATTiny85 microcontroller (U1) to sense current through an ACS712 module (U2). It displays the data in real-time on an OLED display (OLED1) and interacts with three buttons (NEXT, MENU, OK). This compact energy meter is suitable for edge computing and low-power Internet of Things (IoT) applications #project #keypad #arduino #attiny85 #ISP #referenceDesign #edge-computing #edgeComputing #microchip #template #reference-design ## Project Details - **Owner:** vasy_skral - **Created:** 1/8/2024 - **Last Updated:** 3/5/2026 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ - **Copies:** 13 ## Key Components ### J1 — [282837-2](https://www.flux.ai/vasy_skral/282837-2~69k.md) - Manufacturer Part Number: 282837-2 - Manufacturer Name: TE Connectivity AMP Connectors - Part Type: Connector - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=282837&DocType=Customer+Drawing&DocLang=English **Pins:** - 1 - 2 ### MENU — [TS-1088R-02026](https://www.flux.ai/jecstronic/ts-1088r-02026~fo.md) - Manufacturer Part Number: TS-1088R-02026 - Manufacturer Name: XUNPU - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_XUNPU-TS-1088R-02026_C455280.pdf - Part Type: Switch **Pins:** - P1 [pin 1] - P2 [pin 2] ### NEXT — [TS-1088R-02026](https://www.flux.ai/jecstronic/ts-1088r-02026~fo.md) - Part Type: Switch - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_XUNPU-TS-1088R-02026_C455280.pdf - Manufacturer Name: XUNPU - Manufacturer Part Number: TS-1088R-02026 **Pins:** - P1 [pin 1] - P2 [pin 2] ### OK — [TS-1088R-02026](https://www.flux.ai/jecstronic/ts-1088r-02026~fo.md) - Manufacturer Part Number: TS-1088R-02026 - Manufacturer Name: XUNPU - Part Type: Switch - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_XUNPU-TS-1088R-02026_C455280.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### OLED1 — [OLED 0.91" 128x32 I2C](https://www.flux.ai/vasy_skral/oled-091-128x32-i2c~kl.md) - Part Type: Display Device **Pins:** - 5V [pin 3] - GND [pin 4] - SCL [pin 2] - SDA [pin 1] ### PS1 — [HLK-5M05](https://www.flux.ai/jecstronic/hlk-5m05~ry.md) - Datasheet URL: https://5.imimg.com/data5/JI/JR/RP/SELLER-1833510/hlk-5m05-power-module.pdf - Part Type: Power Source - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: HLK-5M05 - Manufacturer Name: Hi-Link **Pins:** - -VO [pin 3] - +VO [pin 4] - AC_1 [pin 1] - AC_2 [pin 2] ### RST — [TS-1088R-02026](https://www.flux.ai/jecstronic/ts-1088r-02026~fo.md) - Manufacturer Part Number: TS-1088R-02026 - Datasheet URL: https://datasheet.lcsc.com/lcsc/1912111437_XUNPU-TS-1088R-02026_C455280.pdf - Part Type: Switch - Manufacturer Name: XUNPU **Pins:** - P1 [pin 1] - P2 [pin 2] ### U1 — [ATTINY85-20SU](https://www.flux.ai/adrian95/attiny85-20su~t3s.md) - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet-Summary.pdf - Manufacturer Part Number: ATTINY85-20SU - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip - Part Type: Microcontroller **Pins:** - ~RESET~/PB5 [pin 1] - AREF/PB0 [pin 5] - GND [pin 4] - PB1 [pin 6] - PB2 [pin 7] - VCC [pin 8] - XTAL1/PB3 [pin 2] - XTAL2/PB4 [pin 3] ### U2 — [ACS712ELCTR-20A-T](https://www.flux.ai/vasy_skral/acs712elctr-20a-t~0sj.md) - Manufacturer Name: Allegro MicroSystems - Part Type: Integrated Circuit - Datasheet URL: https://www.allegromicro.com/~/media/Files/Datasheets/ACS712-Datasheet.ashx - Manufacturer Part Number: ACS712ELCTR-20A-T **Pins:** - FILTER [pin 6] - GND [pin 5] - IP- [pin 4] - IP- [pin 3] - IP+ [pin 2] - IP+ [pin 1] - VCC [pin 8] - VIOUT [pin 7] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/vasy_skral/energy-meter-reference-design~t2l](https://www.flux.ai/vasy_skral/energy-meter-reference-design~t2l).* --- *Generated from [https://www.flux.ai/vasy_skral/energy-meter-reference-design~t2l](https://www.flux.ai/vasy_skral/energy-meter-reference-design~t2l)*