2 layers118.7 × 86.4 mm
2 layers110 × 62.5 mm
Timer
crisap94/Timer-PCBTimer board Using Attiny85 as brain.
- Size
- 110 × 62.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 35
- Pads
- 128
- Tracks, vias
- 295, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 29 Feb 2016
- Updated
- 1 Mar 2016
Overview
Timer is an open-source printed circuit board by crisap94, from the crisap94/Timer-PCB repository on GitHub. It is a 2-layer board of 110 × 62.5 mm with 36 parts on 35 nets, routed with 295 tracks and 0 vias.
It is built around the PCF8574T, LM7805CT and BC547. Its parts include 13 resistors, 7 capacitors, 5 switches, 3 ICs and 2 transistors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
PCF8574T
SOP-16-300mil-40℃~+85℃ 100kHz 10uA 2.5V~6V 25mA 300uA 8 8 Cascading and address extension、Built-in LED driver I2C Interrupt Output Open-drain SOP-16-300mil I/O Expanders ROHSHGSEMII/O Expanders
LM7805CT
TO-2200℃~+70℃@(Ta) 1 1A 20V 2V@(1A) 40uV 5V 62dB@(120Hz) 8mA Fixed Over Current Protection、Short Circuit Protection、Thermal shutdown Positive TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BC547
TO-92Bipolar (BJT)Jiangsu Changjing Electronics Technology (CJ)
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10k | w_pth_resistors:RC03 | R1, R3, R8, R9, R10, R11, R12 |
| 5 | 0.1uF | w_capacitors:cnp_3mm_disc | C3, C4, C5, C6, C7 |
| 4 | 4.6k | w_pth_resistors:RC03 | R4, R5, R6, R7 |
| 2 | BC547 | TO_SOT_Packages_THT:TO-92_Inline_Wide | Q1, Q2 |
| 1 | +M | w_switch:PCB_PUSH | SW2 |
| 1 | +S | w_switch:PCB_PUSH | SW4 |
| 1 | -M | w_switch:PCB_PUSH | SW3 |
| 1 | -S | w_switch:PCB_PUSH | SW5 |
| 1 | 1000uF | w_capacitors:CP_8x11.5mm | C1 |
| 1 | 10k | w_pth_resistors:trimmer_piher_pt6xv | RV1 |
| 1 | 1k | w_pth_resistors:RC03 | R2 |
| 1 | 470uF | w_capacitors:CP_8x11.5mm | C2 |
| 1 | 560 | w_pth_resistors:RC03 | R13 |
| 1 | ATTINY85-P | w_pth_circuits:dil_8-300_socket | IC1 |
| 1 | D | w_pth_diodes:diode_do35 | D1 |
| 1 | LCD16X2 | w_indicators:lcd_16x2 | DS1 |
| 1 | LEDS | w_conn_screw:mors_2p | P1 |
| 1 | LM7805CT | TO_SOT_Packages_THT:TO-220_Neutral123_Horizontal_LargePads | U2 |
| 1 | PCF8574 | w_pth_circuits:dil_16-300_socket | U1 |
| 1 | PWR | w_conn_screw:mors_2p | P2 |
| 1 | RELAY_HJR-3FF_Z | w_relay:relay_hjr-3ff_z | RLY1 |
| 1 | START/STOP | w_switch:PCB_PUSH | SW1 |
Questions
How big is the Timer PCB?
It measures 110 × 62.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Timer use?
36 parts, built around the PCF8574T, LM7805CT and BC547. 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 Timer KiCad files?
From the crisap94/Timer-PCB repository on GitHub, at the commit this page was made from: the board is Timer.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Timer design in my own project?
Its repository states no licence, so its author keeps all rights: ask crisap94 before reusing the design.
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