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Attiny85 time switch

UCSIG·attiny85_time_switch·pcb/attiny85_time_switch_rev1/attiny85_time_switch.kicad_pcb

Attiny85 time switch PCB layout, top view — open source AVR/Arduino board by UCSIG

About the Attiny85 time switch PCB

Attiny85 time switch is an open source AVR/Arduino PCB design by UCSIG, published on GitHub under the MIT license. It is a 2-layer board measuring 85.7 × 85.7 mm, with 32 components from 21 distinct parts.

Its main chip is the PMV20XNER, from the AVR/Arduino family. Other key parts include the ATTINY85V-10PU and AP7383-50W5-7. By type, the board carries 8 connectors, 7 capacitors, 7 resistors, 2 ICs, 2 transistors and 2 switches.

From the project

Low-power time switch using the ATtiny85 microcontroller.

The aim of this project is to switch a load on and off in regular time intervals. The device itself consumes only very little sleep current (~19.6uA on average). The device also monitors the supply voltage and turns off the load if the supply drops lower than the defined threshold.

- Clock calibration algorithm with values stored in the internal eeprom - Supply voltage monitoring - Jumper configuration for feature selection (supply voltage monitoring + time switch/only supply voltage monitoring) - Jumper configuration for undervoltage threshold selection (12/24V) - Low current consumption…

Attiny85 time switch, from the project README
From the project README

Main components on the Attiny85 time switch

ATTINY85V-10PUAP7383-50W5-7

Attiny85 time switch bill of materials (BOM)

32 components, 21 distinct parts.

QtyPartRefs
1
ATTINY85V-10PU
ATtiny85V-10P
U1
1
AP7383-50W5-7
U2
1
PMV20XNER
Q1
1
BSS84AK,215
BSS84AK
Q2
2
CTB0305/2
Screw_Terminal_01x02
J1, J4
1
2213S-06G
Conn_02x03_Odd_Even
J2
3
SPC20484
Conn_01x03_Pin
J3, J5, J6
2
SPC20484
Conn_01x02_Pin
J7, J8
1
EL111
Case1
1
0751.0052
F1
1
TL1105AF160Q
Reset
SW1
1
TL1105AF160Q
Check FET
SW2
1
1N4007RLG
D
D1
1
703-0100
LED
D2
3
FG18X5R1H105KRT06
1u
C1, C2, C6
4
TS170R1H104MSBFB0R
100n
C3, C4, C5, C7
1
100k
R1
1
22k
R2
2
1M
R3, R5
2
10k
R4, R7
Show 1 more
QtyPartRefs
1
3k3
R6

Attiny85 time switch design files

The KiCad project lives in the UCSIG/attiny85_time_switch repository on GitHub; these links point at the commit this page was built from.

Attiny85 time switch: common questions

What microcontroller does the Attiny85 time switch use?

The Attiny85 time switch is built around the PMV20XNER, from the AVR/Arduino family.

How big is the Attiny85 time switch PCB?

The Attiny85 time switch measures 85.7 × 85.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Attiny85 time switch?

32 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Attiny85 time switch design files?

From the UCSIG/attiny85_time_switch repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Attiny85 time switch design in my own project?

Yes, under the terms of its MIT license, which UCSIG chose for the repository.

Can I test firmware for the Attiny85 time switch 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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