2 layers78 × 124 mm
Driver2
ieb/UltrasonicAntifouling
Code and PCB to for Ultrasonic Antifouling units designed to be installed on the hull
47 parts
2 layers73.5 × 73 mm
VoltageSwitch
ieb/SolaryVoltageSwitchControls loads connected to a Lipo battery with BMS + solar panel.. for a pond pump.
- Size
- 73.5 × 73 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 44
- Nets
- 28
- Pads
- 119
- Tracks, vias
- 222, 0
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 4
- Created
- 24 Mar 2023
- Updated
- 9 Sep 2023
Overview
VoltageSwitch is an open-source printed circuit board by ieb, from the ieb/SolaryVoltageSwitch repository on GitHub. It is a 2-layer board of 73.5 × 73 mm with 44 parts on 28 nets, routed with 222 tracks and 0 vias.
It is built around the LM7808ACT, BC817-40 and IRF540N. Its parts include 14 resistors, 13 connectors, 4 ICs, 4 diodes and 4 transistors. It belongs with the power boards of this library.
Main components
3LM7808ACT
TO-2200℃~+125℃@(Ta) 1 1A 2V@(1A) 35V 5mA 62dB@(120Hz) 8V Fixed Positive Short Circuit Protection、Thermal shutdown TO-220 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSonsemiVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
BC817-40
SOT-23-65℃~+150℃ 1 NPN 100MHz 100nA 250 345mW 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSNexperiaBipolar (BJT)
IRF540N
TO-2201 N-channel 1.35nF 100V 130W 280pF 33A 35mΩ@10V 4V 52nC@10V 85pF N-Channel TO-220 MOSFETs ROHSOSENMOSFETs
README
README.mdVoltage Switch
Originally this code was written as a voltage switch for a lead acid batter, connected to a solar pannel, that would turn on when the voltage is high, and off when low. For years it powered a pond pump, but my wife got super annoyed by the large 12v battery in the flower bed.
This is 2023, and there are lithium batters. Acer laptop battery packs are 11.1v at 7K Ah with a TI BQ4050 Lipo state of charge chip. The chip is on I2C so the code has been rewitten to use this chip basing the turn on and turn off points on the state of chage. On above 70% provided the solar volate is > 12V, and off when < 30% or if the solar volate drops below 11.5v (ie its dark)
The LED flashes once the pump is on and 2x when its off.
Battery
I am using a 9x18650 Acer batter pack with a BMS controlled by a TI BQ4050 chip. (chip data sheet. https://www.ti.com/lit/ug/sluuaq3a/sluuaq3a.pdf)
The BMS is probably a cheap clone. With the packs feet on the ground looking at the pack the pins are
| | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | |
-----------------------------------------1,2 BatV+ 3 ID - Currently not known 4 ID - Currently purpose not known 5 SDA 6 SCL 7 0V 8 0V
Parts
44| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 10K | Resistors_SMD:R_0805_HandSoldering | R101, R103, R108, R111, R114 |
| 4 | CONN_1 | Mounting_Holes:MountingHole_3.2mm_M3_ISO7380 | P105, P106, P107, P108 |
| 3 | 4K7 | Resistors_SMD:R_0805_HandSoldering | R102, R112, R113 |
| 2 | 1K | Resistors_SMD:R_0805_HandSoldering | R107, R110 |
| 2 | 2K2 | Resistors_SMD:R_0805_HandSoldering | R105, R109 |
| 2 | BC817-40 | TO_SOT_Packages_SMD:SOT-23 | Q101, Q103 |
| 2 | FUSE | Divers:BladeFuse-CarType | F101, F102 |
| 2 | IN4001 | Diodes_SMD:D_0805 | D102, D104 |
| 2 | IRF540N | TO_SOT_Packages_THT:TO-220_Neutral123_Vertical_LargePads | Q102, Q104 |
| 2 | LED | LEDs:LED_0805 | D101, D103 |
| 2 | PC817 | Housings_DIP:DIP-4_W7.62mm_LongPads | IC101, IC102 |
| 1 | 100n | Capacitors_SMD:C_0805_HandSoldering | C102 |
| 1 | 10u | Capacitors_SMD:C_0805_HandSoldering | C101 |
| 1 | 22K | Resistors_SMD:R_0805_HandSoldering | R106 |
| 1 | 4k7 | Resistors_SMD:R_0805_HandSoldering | R104 |
| 1 | ArdinoMinPro | Divers:ArduinoProMini | U101 |
| 1 | Bat-Term | Wire_Pads:SolderWirePad_single_2mmDrill | P111 |
| 1 | BatCharge+ | Wire_Pads:SolderWirePad_single_2mmDrill | P109 |
| 1 | BatTerm+ | Wire_Pads:SolderWirePad_single_2mmDrill | P110 |
| 1 | LM7808ACT | TO_SOT_Packages_THT:TO-220_Neutral123_Vertical_LargePads | U102 |
| 1 | Pump+ | Wire_Pads:SolderWirePad_single_2mmDrill | P101 |
| 1 | Pump- | Wire_Pads:SolderWirePad_single_2mmDrill | P102 |
| 1 | S1 | Wire_Pads:SolderWirePad_single_2mmDrill | P103 |
| 1 | S2 | Wire_Pads:SolderWirePad_single_2mmDrill | P104 |
| 1 | Solar+ | Wire_Pads:SolderWirePad_single_2mmDrill | P112 |
| 1 | Solar- | Wire_Pads:SolderWirePad_single_2mmDrill | P113 |
| 1 | THERMISTOR | Resistors_ThroughHole:Resistor_Vertical_RM5mm | TH101 |
Questions
How big is the VoltageSwitch PCB?
It measures 73.5 × 73 mm and has 2 copper layers, 1.6 mm thick.
What parts does the VoltageSwitch use?
44 parts, built around the LM7808ACT, BC817-40 and IRF540N. 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 VoltageSwitch KiCad files?
From the ieb/SolaryVoltageSwitch repository on GitHub, at the commit this page was made from: the board is pcb/VoltageSwitch.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the VoltageSwitch design in my own project?
Its repository states no licence, so its author keeps all rights: ask ieb before reusing the design.
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