4 layers68.1 × 102.5 mm
DC PoE Injector
jwpleow/DC_PoE_Injector
Midspan 802.3at PoE Injector, with DC power supply input, in KiCAD
71 parts2
2 layers54.5 × 29.5 mm
PWM GripHeat
atomspring/PWM-GripHeatRugged PWM control for a motorcycle grip heater
- Size
- 54.5 × 29.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 56
- Nets
- 29
- Pads
- 144
- Tracks, vias
- 204, 36
- Pours
- 155
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 25 Nov 2024
- Updated
- 13 Dec 2024
Overview
PWM GripHeat is an open-source printed circuit board by atomspring, from the atomspring/PWM-GripHeat repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 54.5 × 29.5 mm with 56 parts on 29 nets, routed with 204 tracks and 36 vias.
It is built around the ATTINY85-20PU, LM324 and SIA462DJ, with the BZV55B5V1, BZV55B18 and SRR7045-331M among its other parts. Its parts include 15 resistors, 13 capacitors, 9 diodes, 3 ICs and 2 connectors. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
8
ATTINY85-20PU
PDIP-8-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 512Byte 512Byte 6 8 Bit 8KB AVR Built-in FLASH PDIP-8 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM324
SOP-14-1.5V~10V 0℃~+70℃ 24V 250nA 3V~20V 4 40mA 50nA 700uA 7mV 80dB SOP-14 Operational Amplifier ROHSHXY MOSFETOperational Amplifier
SIA462DJ
PowerPAK-SC-70-6L-55℃~+150℃ 1 N-channel 12A 18mΩ@10V 2.4V 3.5W 30V 52pF 570pF 5nC@10V PowerPAK-SC-70-6L MOSFETs ROHSVishay IntertechnologyMOSFETs
BZV55B5V1
LL-34-65℃~+200℃ 1 Independent 100nA@1V 35Ω 5.1V 500mW 550Ω 5V~5.2V LL-34 Zener Diodes ROHSLGEZener DiodesBZV55B18
-Zener DiodesTaiwan SemiconductorSRR7045-331M
SMD,7x7mm270mA 270mA 330uH 730mΩ ±20% SMD,7x7mm Power Inductors ROHSBournsPower Inductors
EMK325ABJ107MM-T
1210100uF 16V X5R ±20% 1210 Multilayer Ceramic Capacitors MLCC - SMD/SMT ROHSTaiyo YudenMultilayer Ceramic Capacitors MLCC - SMD/SMT
2920L110/60MR
2920-40℃~+85℃ 1.1A 120mΩ 2.2A 20A 2W 2mm 410mΩ 5.44mm 500ms 60V 7.98mm 2920 Resettable Fuses ROHSLittelfuseResettable Fuses
README
README.mdPWM-GripHeat
Rugged PWM control for a grip heater using an attiny85 and a beefy NMOS, supporting a dual color or RGB indicator, with careful attention paid to power usage.
KiCad 8.0 Schematics and PCB files are (as expected) under the "hardware" folder, firmware is under the "firmware" folder.
Cost for a single board was TODO: fill in total costs, total including optional mechanical components was TODO:
Hardware
The BOM (bill-of-materials) is relatively short, holding all mechanical components in here, and the PCB components here.
Assembly should take about an hour's work with the right tools. I use lead-free solder paste for all my work, with the PCB itself using ENIG for all pads. Soldering is sped up by using a hand-held hot air reflow gun, but all pads are big enough to facilitate hand soldering.
Firmware
I'm using PlatformIO on VSCodium to write the fairly simple firmware, build steps:
- Item 1
- rr
- te
License
This project is:
- Software: GPL3 protected
- Hardware: CERN-OHL-S-2.0 (https://spdx.org/licenses/CERN-OHL-S-2.0.html)
Parts
56| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C8, C9, C10, C12, C13 |
| 5 | BZV55B5V1 | Diode_SMD:D_MiniMELF | D4, D8, D9, D10, D11 |
| 4 | 100R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5, R6, R7, R8 |
| 4 | 470k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3, R12, R13, R14 |
| 4 | BZV55B18 | Diode_SMD:D_MiniMELF | D1, D2, D6, D7 |
| 2 | 100k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R10, R11 |
| 2 | 100k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R2, R4 |
| 2 | 10nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C11, C14 |
| 2 | 1k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R9, R15 |
| 2 | GND | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | TP9, TP10 |
| 1 | +5V | TestPoint:TestPoint_Pad_D1.5mm | TP3 |
| 1 | +BATT | TestPoint:TestPoint_Pad_D1.5mm | TP1 |
| 1 | +IGN | TestPoint:TestPoint_THTPad_D1.0mm_Drill0.5mm | TP2 |
| 1 | 0R | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R17 |
| 1 | 1770885 | TerminalBlock:TerminalBlock_MaiXu_MX126-5.0-02P_1x02_P5.00mm | J1 |
| 1 | 330uH | myESP32s:L_Bourns_SRR7045 | L1 |
| 1 | ATtiny85-20P | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | BLUE | TestPoint:TestPoint_Pad_D1.5mm | TP7 |
| 1 | EMK325ABJ107MM-T | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C7 |
| 1 | GRN | TestPoint:TestPoint_Pad_D1.5mm | TP6 |
| 1 | LM324 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U3 |
| 1 | LMZM23600V5 | Package_LGA:Texas_SIL0010A_MicroSiP-10-1EP_3.8x3mm_P0.6mm_EP0.7x2.9mm_ThermalVias | PS1 |
| 1 | LOGO | Atomspring Logos:10x10mm | G*** |
| 1 | PWM | TestPoint:TestPoint_Pad_D1.5mm | TP8 |
| 1 | Polyfuse_Small | Fuse:Fuse_2920_7451Metric_Pad2.10x5.45mm_HandSolder | F1 |
| 1 | RED | TestPoint:TestPoint_Pad_D1.5mm | TP5 |
| 1 | SW_IN | TestPoint:TestPoint_Pad_D1.5mm | TP4 |
| 1 | Screw_Terminal_01x08 | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical | J2 |
| 1 | SiA462DJ | Package_TO_SOT_SMD:Vishay_PowerPAK_SC70-6L_Single | U2 |
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Questions
How big is the PWM GripHeat PCB?
It measures 54.5 × 29.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the PWM GripHeat use?
56 parts, built around the ATTINY85-20PU, LM324, SIA462DJ and BZV55B5V1. 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 PWM GripHeat KiCad files?
From the atomspring/PWM-GripHeat repository on GitHub, at the commit this page was made from: the board is hardware/PWM GripHeat.kicad_pcb and its schematic hardware/PWM GripHeat.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the PWM GripHeat design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).