2 layers33 × 21.6 mm
Sigamp
dodotronix/Haptix
Project that process data from pressure sensor to control the punch sharpening
18 parts
2 layers53.8 × 42.4 mm
SubtractMod
dodotronix/HaptixProject that process data from pressure sensor to control the punch sharpening
- Size
- 53.8 × 42.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 45
- Nets
- 42
- Pads
- 127
- Tracks, vias
- 160, 19
- Pours
- 21
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 19 May 2018
- Updated
- 23 Aug 2025
Overview
SubtractMod is an open-source printed circuit board by dodotronix, from the dodotronix/Haptix repository on GitHub. It is a 2-layer board of 53.8 × 42.4 mm with 45 parts on 42 nets, routed with 160 tracks and 19 vias.
It is built around the AD8276AR, AD8244BRM and LMP2011MA. Its parts include 7 resistors, 6 ICs, 5 capacitors, 3 connectors and 1 diode.
Main components
3
AD8276AR
SOIC8Low Power, Wide Supply Range, Low Cost Unity-Gain Difference AmplifierAnalog DevicesUncategorised
AD8244BRM
MSOP10Single-Supply, Low Power, Precision FET Input Quad BufferAnalog DevicesUncategorisedLMP2011MA
SOIC-8-40℃~+125℃ 1 130dB 15mA 15nV/℃ 2.7V~5.25V 25uV 35nV/√Hz 3MHz 3pA 4V/us 6pA 930uA Rail-to-rail output Zero drift / auto-zero、Built-in compensation SOIC-8 Precision Op Amps ROHSTexas InstrumentsPrecision Op Amps
README
README.mdHAPTIX
INSTALL
-
install Archlinux on SD card (https://archlinuxarm.org/platforms/armv6/raspberry-pi)
-
turn on RPi
-
use ssh or keyboard and display to continue in installation
-
update system with
pacman -Syu
- download
pacman -S python
- download snap shot from link: https://aur.archlinux.org/packages/python-spidev/
- open terminal -> cd /path/to/file -> tar xzf file-name -> cd file-name -> makepkg -s -> sudo pacman -U name-of-file.pkg.tar.xz
- copy test.py to raspberry
- cd /path/to/test.py
- chmod +x test.py
- ./test.py
- you select functions in script, which you want to run
NOTES
- spidev doc (https://github.com/doceme/py-spidev)
- raspberry ssh command: ssh alarm@10.0.4.x, password: "alarm" (custom settings)
- sudo iptables -t nat -vnL
- setup.sh creates nat, starts dhcpcd, launchs ssh (parameters: on/off)
Parts
45| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | TestPoint | TestPoint:TestPoint_Pad_3.0x3.0mm | TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP10, TP11 |
| 6 | R_POT_TRIM | Potentiometer_SMD:Potentiometer_Bourns_3314J_Vertical | RV1, RV2, RV3, RV4, RV5, RV6 |
| 6 | R_Potentiometer_Trim | Potentiometer_SMD:Potentiometer_Bourns_3314J_Vertical | RV1, RV2, RV3, RV4, RV5, RV6 |
| 4 | 0R | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4 |
| 3 | AD8276 | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1, U2, U4 |
| 3 | C | Capacitor_SMD:C_0603_1608Metric | C1, C2, C5 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 2 | 47u | Capacitor_SMD:CP_Elec_6.3x5.9 | C3, C4 |
| 2 | Screw_Terminal_01x04 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-4-5.08_1x04_P5.08mm_Horizontal | J1, J2 |
| 1 | AD8244 | Package_SO:MSOP-10_3x3mm_P0.5mm | IC1 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | LMP2011 | Package_TO_SOT_SMD:SOT-23-5 | IC2 |
| 1 | R | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | Screw_Terminal_01x02 | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-2_1x02_P5.00mm_Horizontal | J3 |
| 1 | TLV6001DCK | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U3 |
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Questions
How big is the SubtractMod PCB?
It measures 53.8 × 42.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the SubtractMod use?
45 parts, built around the AD8276AR, AD8244BRM and LMP2011MA. 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 SubtractMod KiCad files?
From the dodotronix/Haptix repository on GitHub, at the commit this page was made from: the board is hw/subtractMod/subtractMod.kicad_pcb and its schematic hw/load_cell_amplifier/load_cell_amplifier.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the SubtractMod design in my own project?
Its repository states no licence, so its author keeps all rights: ask dodotronix before reusing the design.