# 4-Wire RTD Measurement System ## Description Simple 4-wire RTD measurement system using ATMEGA and ADI MAX31865 ## Project Details - **Owner:** coope248 - **Created:** 6/4/2023 - **Last Updated:** 6/5/2023 - **Visibility:** Public ## Key Components ### J1 — [2-Position Screw Terminal](https://www.flux.ai/corynrobinson/2-position-screw-terminal~s4.md) - Manufacturer Name: Würth Elektrik - Part Type: Connector - Manufacturer Part Number: 691137710002 - Datasheet URL: https://www.we-online.com/katalog/datasheet/691137710002.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### J2 — [2-Position Screw Terminal](https://www.flux.ai/corynrobinson/2-position-screw-terminal~s4.md) - Datasheet URL: https://www.we-online.com/katalog/datasheet/691137710002.pdf - Part Type: Connector - Manufacturer Name: Würth Elektrik - Manufacturer Part Number: 691137710002 **Pins:** - P1 [pin 1] - P2 [pin 2] ### U1 — [ATMEGA328PB-AU](https://www.flux.ai/adrian95/atmega328pb-au~88i.md) - Manufacturer Part Number: ATMEGA328PB-AU - Part Type: Microcontroller - Manufacturer Name: Microchip - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/40001907A.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~RESET~/PC6 [pin 29] - AREF [pin 20] - AVCC [pin 18] - GND [pin 21] - GND [pin 5] - PB0 [pin 12] - PB1 [pin 13] - PB2 [pin 14] - PB3 [pin 15] - PB4 [pin 16] - PB5 [pin 17] - PC0 [pin 23] - PC1 [pin 24] - PC2 [pin 25] - PC3 [pin 26] - PC4 [pin 27] - PC5 [pin 28] - PD0 [pin 30] - PD1 [pin 31] - PD2 [pin 32] - PD3 [pin 1] - PD4 [pin 2] - PD5 [pin 9] - PD6 [pin 10] - PD7 [pin 11] - PE0 [pin 3] - PE1 [pin 6] - PE2 [pin 19] - PE3 [pin 22] - VCC [pin 4] - XTAL1/PB6 [pin 7] - XTAL2/PB7 [pin 8] ### U2 — [MAX31865AAP+](https://www.flux.ai/vasy_skral/max31865aapplus~4x7.md) - Manufacturer Name: Maxim Integrated - Manufacturer Part Number: MAX31865AAP+ - Datasheet URL: https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf - Part Type: Integrated Circuit **Pins:** - ~CS [pin 16] - ~DRDY [pin 1] - BIAS [pin 4] - DGND [pin 18] - DVDD [pin 2] - FORCE- [pin 12] - FORCE+ [pin 8] - FORCE2 [pin 9] - GND [pin 19] - GND [pin 13] - ISENSOR [pin 7] - NC [pin 20] - REFIN- [pin 6] - REFIN+ [pin 5] - RTDIN- [pin 11] - RTDIN+ [pin 10] - SCLK [pin 15] - SDI [pin 14] - SDO [pin 17] - VDD [pin 3] ### X1 — [ECS-160-S-4](https://www.flux.ai/adrian95/ecs-160-s-4~q37.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ECS-160-S-4 - Manufacturer Name: ECS Inc. - Part Type: Oscillator - Datasheet URL: https://ecsxtal.com/store/pdf/hc_49us.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/coope248/4-wire-rtd-measurement-system~hs](https://www.flux.ai/coope248/4-wire-rtd-measurement-system~hs).* --- *Generated from [https://www.flux.ai/coope248/4-wire-rtd-measurement-system~hs](https://www.flux.ai/coope248/4-wire-rtd-measurement-system~hs)*