This is an ATSAMD21G16x based ESR and capacitance meter. Due to program size, at least the 16 chip is required (64 KB Flash, 8 KB RAM). The code is written so that the meter automatically tests for both capacitance & ESR when a new capacitor is connected. This meter can also be used as a low ohmage ohm-meter for resistors <~100 ohms. Currently the values are displayed on a 16x2 character display.

• Automatic capacitance & ESR measurement
• ESR measurement averaging with up to 1024x256=262144 samples, 1024 samples guaranteed
• Measure capacitance at least twice (waits in between) to eliminate any contact bounce issues

• Nice schematic
• Photos of prototype
• (Maybe) utilize a better display in the future like 20x4
• Option to calibrate & adjust capacitance measurements
• Option to calibrate & adjust ESR measurements semi-automatically
• Calibration values via USB
• Option to save calibration values to flash via USB

• ATSAMD21E16A

• ATSAMD21E16B

• ATSAMD21G16A

• ATSAMD21G16B

• ATSAMD21J16A

• ATSAMD21J16B

• ATSAMD21E17A

• ATSAMD21E17B

• ATSAMD21G17A

• ATSAMD21G17B

• ATSAMD21J17A

• ATSAMD21J17B

• ATSAMD21E18A

• ATSAMD21E18B

• ATSAMD21G18A

• ATSAMD21G18B

• ATSAMD21J18A

• ATSAMD21J18B

• ATSAMD20E16

• ATSAMD20G16

• ATSAMD20J16

• ATSAMD20E17

• ATSAMD20G17

• ATSAMD20J17

• ATSAMD20E18

• ATSAMD20G18

• ATSAMD20J18

• ATSAML21E16A

• ATSAML21E16B

• ATSAML21G16A

• ATSAML21G16B

• ATSAML21J16A

• ATSAML21J16B

• ATSAML21E17A

• ATSAML21E17B

• ATSAML21G17A

• ATSAML21G17B

• ATSAML21J17A

• ATSAML21J17B

• ATSAML21E18A

• ATSAML21E18B

• ATSAML21G18A

• ATSAML21G18B

• ATSAML21J18A

• ATSAML21J18B

• ATSAMC21E16

• ATSAMC21G16

• ATSAMC21J16

• ATSAMC21E17

• ATSAMC21G17

• ATSAMC21J17

• ATSAMC21N17

• ATSAMC21E18

• ATSAMC21G18

• ATSAMC21J18

• ATSAMC21N18

• ATSAMC20E16

• ATSAMC20G16

• ATSAMC20J16

• ATSAMC20E17

• ATSAMC20G17

• ATSAMC20J17

• ATSAMC20N17

• ATSAMC20E18

• ATSAMC20G18

• ATSAMC20J18

• ATSAMC20N18

This project uses the MIT license.