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EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display

manoj-karna17·EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display

EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display PCB layout, top view — open source AVR/Arduino board by manoj-karna17

About the EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display PCB

EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display is an open source AVR/Arduino PCB design by manoj-karna17, published on GitHub. It is a 2-layer board measuring 136 × 60 mm, with 15 components from 8 distinct parts.

Its main chip is the ATTINY85-20P, from the AVR/Arduino family. Other key parts include the 74HC595N, SC39-11GWA and LM7805_TO220. By type, the board carries 11 resistors and 4 ICs.

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

From the project

This project monitors and displays the voltage level of an electric vehicle (EV) battery using a microcontroller-based setup. The system uses analog voltage sampling, voltage regulation, and a 74HC595 shift register to drive a 7-segment LED display, all designed and tested using KiCad.

1. ATtiny85 PB3 (Pin 2) → Voltage divider output (Analog input). 2. 74HC595 Q0-Q6 → 7-Segment Display segments (with resistors). 3. Common pin of 7-Segment → VCC (Common Anode) or GND (Common Cathode). 4All grounds connected together. ---------------- How it works: ---------------- 12Volts Battery | v Voltage Regulator (LM7805): Converts 12V to 5V | v Voltage Divider: Scales the battery voltage | v Micro controller (ATtiny85): Reads voltage and calculates battery level | v Shift register (74HC595): Send data to display | v 7-Segment display: Shows battery level

Main components on the EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display

ATTINY85-20P74HC595NSC39-11GWALM7805_TO220

EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display bill of materials (BOM)

15 components, 8 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATTINY85-20P
ATtiny85-20P
U1
1
74HC595N
LOGIC-74HC595N_DIP16_
U2
1
SC39-11GWA
U3
1
LM7805_TO220
U4
1
10K
R1
1
3.3K
R2
8
220
R3, R4, R5, R6, R7, R8, R9, R10
1
R
R11

EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display design files

The KiCad project lives in the manoj-karna17/EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display repository on GitHub; these links point at the commit this page was built from.

EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display: common questions

What microcontroller does the EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display use?

The EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display is built around the ATTINY85-20P, from the AVR/Arduino family.

How big is the EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display PCB?

The EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display measures 136 × 60 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display?

15 components, from 8 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 EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display design files?

From the manoj-karna17/EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display 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 EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display design in my own project?

The repository has no license, so all rights stay with manoj-karna17. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the EV-Battery-Level-Indicator-Using-ATtiny85-7-Segment-Display without the hardware?

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

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