EMGauntlet

Based on project at https://hackaday.io/project/8823-super-simple-muscle-emg-sensor/details

Muscles create many action potentials during a movement, like moving your arm or closing your hands. This creates a measurable signal, which shows an increase in signal due to different fingers moving. (Hackaday)

This project extends the Hackaday project to wirelessly communicate the EMG signals to another device.

Why did I make this? Because it's cool. Also, current medical EMG procedures are more invasive and they hurt so this is a better (albeit less precise) alternative.

BOM

Ref	Qnty	Value	Cmp name	Footprint	Description	Vendor	Link
C1	1	47uF	C	Capacitor_SMD:C_0805_2012Metric	Unpolarized capacitor	Digikey	https://www.digikey.com/en/products/detail/samsung-electro-mechanics/CL21A476MQYNNNG/3894447
C2, C3, C4, C5, C6, C7	3	10uF	C	Capacitor_SMD:C_0805_2012Metric	Unpolarized capacitor	Digikey	https://www.digikey.com/en/products/detail/taiyo-yuden/LMK212BJ106KG-T/930652
C8, C9	2	1uF	C	Capacitor_SMD:C_0805_2012Metric	Unpolarized capacitor	Digikey	https://www.digikey.com/en/products/detail/samsung-electro-mechanics/CL21B105KBFNNNE/3886687
D1	1	D	D	Diode_SMD:D_0805_2012Metric	Diode	Digikey	https://www.digikey.com/en/products/detail/kyocera-avx/SD0805S020S0R5/3749524
D2	1	LED	LED	LED_SMD:LED_0805_2012Metric	Light emitting diode	Digikey	https://www.digikey.com/en/products/detail/ams-osram-usa-inc/LG-R971-KN-1-0-20-R18/1227925
D3	1	D_Schottky	D_Schottky	Diode_SMD:D_SMA	Schottky diode	Digikey	https://www.digikey.com/en/products/detail/mcc-micro-commercial-components/SK54A-LTP/5114132?s=N4IgTCBcDaIMoGkCsAWAggWgDIBUAKIAugL5A
J1	1	Conn_01x02_Pin	Conn_01x02_Pin	Connector_JST:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_Horizontal	Generic connector, single row, 01x02, script generated	Digikey	https://www.digikey.com/en/products/detail/jst-sales-america-inc/S2B-PH-SM4-TB/926655?s=N4IgTCBcDaIMpgEIFoAKAJZcCyAWZAKogBQAyAYgJTFwBylIAugL5A
J3	1	USB_C_Receptacle_USB2.0_16P	USB_C_Receptacle_USB2.0_16P	Connector_USB:AMPHENOL_12402012E212A	USB 2.0-only 16P Type-C Receptacle connector	Digikey	https://www.digikey.com/en/products/detail/amphenol-cs-commercial-products/12402012E212A/13683192
R1	1	5.7k	R	Resistor_SMD:R_0805_2012Metric	Resistor	Amazon	https://www.amazon.com/Yobett-ohm-8850pcs-Resistor-Sample/dp/B013B55KQE?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&smid=A3SC7BPT5ZUZY6&gQT=1&th=1
R2	1	1k	R	Resistor_SMD:R_0805_2012Metric	Resistor	Amazon	https://www.amazon.com/Yobett-ohm-8850pcs-Resistor-Sample/dp/B013B55KQE?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&smid=A3SC7BPT5ZUZY6&gQT=1&th=1
R3, R4	2	100k	R	Resistor_SMD:R_0805_2012Metric	Resistor	Amazon	https://www.amazon.com/Yobett-ohm-8850pcs-Resistor-Sample/dp/B013B55KQE?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&smid=A3SC7BPT5ZUZY6&gQT=1&th=1
R6, R7, R8	3	5.1k	R	Resistor_SMD:R_0805_2012Metric	Resistor	Amazon	https://www.amazon.com/Yobett-ohm-8850pcs-Resistor-Sample/dp/B013B55KQE?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&smid=A3SC7BPT5ZUZY6&gQT=1&th=1
SW1	1	SW_SPST	SW_SPST	Button_Switch_SMD:SW_DPDT_CK_JS202011JCQN	Single Pole Single Throw (SPST) switch	Digikey	https://www.digikey.com/en/products/detail/c-k/JS202011JCQN/6137630?s=N4IgTCBcDaIFIGUwAYUEY1wMIEUByIAugL5A
SW3, SW4	2	SW_Push	SW_Push	Button_Switch_SMD:SW_TS04-66-50-BK-160-SMT	Push button switch, generic, two pins	Digikey	https://www.digikey.com/en/products/detail/cts-electrocomponents/222AMVBAR/5227982
U1	1	INA128	INA128UA	Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm	Precision, Low Power Instrumentation Amplifier G = 1 + 50kOhm/Rg, DIP-8/SOIC-8	Digikey	https://www.digikey.com/en/products/detail/texas-instruments/INA128UA/300997
U3	1	MCP73831T-2ACI_OT	MCP73831T-2ACI_OT	open-Smartwatch:SOT-23-5	IC CONTROLLR LI-ION 4.2V SOT23-5	Digikey	https://www.digikey.com/en/products/detail/microchip-technology/MCP73831T-2ACI-OT/964301
U4	1	DMG3415U-7	DMG3415U-7	Package_TO_SOT_SMD:SOT95P240X105-3N		Digikey	https://www.digikey.com/en/products/detail/diodes-incorporated/dmg3415u-7/2052768
U5	1	AP2112K-3.3	AP2112K-3.3	Package_TO_SOT_SMD:SOT-23-5	600mA low dropout linear regulator, with enable pin, 3.8V-6V input voltage range, 3.3V fixed positive output, SOT-23-5	Digikey	https://www.digikey.com/en/products/detail/diodes-incorporated/AP2112K-3-3TRG1/4470746?s=N4IgTCBcDaIIIAUwEZlgNIFoDMA6bIAugL5A
U6	1	ESP32-S3-WROOM-1-N16R2	ESP32-S3-WROOM-1-N16R2	RF_Module:ESP32-S3-WROOM-1		Digikey	https://www.digikey.com/en/products/detail/espressif-systems/esp32-s3-wroom-1-n16r8/16162642

Schematic and PCB

Use example circuits. Otherwise you might end up learning too much electrical engineering and that's not good! Hardest part was figuring out the footprints because most of the components I used were not in Kicad and its just annoying PCB was wired up using FreeRouting

Firmware

Just used the analog read program built into Arduino IDE to collect data

CAD

This depends HEAVILY on the person and its strongly recommended to use photogrammetry to figure it out properly. Also the electrode placement will vary from person to person.