2 layers160 × 100 mm
MPCNC Nano Estlcam Shield
tnn85/MPCNC-Nano-Estlcam-Shield
Ein CNC Shield für die MPCNC in Verwendung mit Estlcam
96 parts70
2 layers
Battery Health Monitor for LiPo batteries in hobbyist applications
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 11
- Nets
- 11
- Pads
- 37
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 24 Feb 2024
- Updated
- 5 May 2026
Overview
Bhm is an open-source printed circuit board by Bertruss, from the Bertruss/BatteryHealthMonitor repository on GitHub. It is a 2-layer board with 11 parts on 11 nets.
It is built around the ATTINY45-20PU and LM358. Its parts include 5 resistors, 3 ICs, 2 capacitors and 1 connector. It belongs with the power boards and the AVR (ATmega, ATtiny) boards of this library.
Main components
2
ATTINY45-20PU
DIP-8-40℃~+85℃ 10bit 2.7V~5.5V 20MHz 256Byte 256Byte 4KB 6 8 Bit AVR Built-in FLASH DIP-8 Microcontrollers (MCU/MPU/SOC) ROHSMicrochip TechnologyMicrocontrollers (MCU/MPU/SOC)
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
README
README.mdBattery Health Monitor
ATtiny45/85 based dedicated battery health monitor for embedded projects, with small status readout
Setup Notes:
- lfuse set to 0xE2 to remove the DIV8 and set the clock to full 8mhz
example: programming using the USBtinyISP via avrdude
avrdude -c usbtiny -p t45 -U hfuse:w:0xE2:m- The font data was intended to be written to eeprom on the chip to save flash, not knowing what the total compiled footprint of the code would be beforehand, I assumed I would need to be covetous of the limited 4k flash, and yet as development went on that seemed less and less necessary ¯\(ツ)/¯.
I used Microchip Studio for a lot of this development. If you want to not clear the eeprom every time you reflash the program storage, set the eeprom protect bit:
avrdude -c usbtiny -p t45 -U hfuse:w:0xD7:mParts
11| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 300k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R2, R3, R4, R5 |
| 1 | .01uf | Capacitor_THT:C_Disc_D5.0mm_W2.5mm_P5.00mm | C2 |
| 1 | .33uf | Capacitor_THT:C_Radial_D4.0mm_H7.0mm_P1.50mm | C1 |
| 1 | 10k | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P7.62mm_Horizontal | R1 |
| 1 | ATtiny45-20P | Package_DIP:DIP-8_W7.62mm | U2 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
| 1 | LM358 | Package_DIP:DIP-8_W7.62mm | U1 |
| 1 | LM78L05_TO92 | Package_TO_SOT_THT:TO-92_Inline | U3 |
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Questions
What parts does the Bhm use?
11 parts, built around the ATTINY45-20PU and LM358. 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 Bhm KiCad files?
From the Bertruss/BatteryHealthMonitor repository on GitHub, at the commit this page was made from: the board is schematic/bhm/bhm.kicad_pcb and its schematic schematic/bhm/bhm.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bhm design in my own project?
Its repository states no licence, so its author keeps all rights: ask Bertruss before reusing the design.