# PT100 Amplifier Board
# What's included
| Item | Quantity |
|---|---|
| PT100 Analog Amplifier PCB | 1 |
| Sensor cable | 1 |
# What’s required
- PT100 Sensor (you can buy one here (opens new window))
- A compatible 3D Printer Controller (Ramps 1.4, SKR boards, MKS boards, Smoothieboard, ReArm, etc.)
WARNING
This PT100 Amplifier board is not compatible with DUET boards. To use PT100 sensors with DUET boards and RepRap firmware, you need to buy DUET PT100 daughter boards (opens new window).
# Specifications
| Features | Specification |
|---|---|
| Compatible firmware | Marlin 2.0.9.4 (or above)(https://github.com/DyzeDesign/Marlin/releases/latest (opens new window)) |
# Electrical Specifications
| Parameter | Condition | Min | Typical | Max | Unit |
|---|---|---|---|---|---|
| Power supply (Vcc) | Controller logic voltage: 3.3V | - | 3.3 | - | V |
| Controller logic voltage: 5V | - | 5 | - | V | |
| Current consumption | 0.5 | - | 1.5 | mA | |
| Output Tension (Vout) | 0.15 | - | Vcc-0.15 | V |
# Output voltage lookup table
| Temperature (°C) | PT100 value(Ω) | Output voltage (V) @ 3.3V | Output voltage (V) @ 5V |
|---|---|---|---|
| 0 | 100 | 0.8822 | 1.3367 |
| 20 | 107.794 | 0.9497 | 1.4389 |
| 40 | 115.541 | 1.0165 | 1.5401 |
| 60 | 123.242 | 1.0827 | 1.6405 |
| 80 | 130.897 | 1.1484 | 1.7400 |
| 100 | 138.505 | 1.2135 | 1.8387 |
| 120 | 146.068 | 1.2780 | 1.9364 |
| 140 | 153.584 | 1.3420 | 2.0333 |
| 160 | 161.054 | 1.4054 | 2.1294 |
| 180 | 168.478 | 1.4683 | 2.2246 |
| 200 | 175.856 | 1.5305 | 2.3190 |
| 220 | 183.188 | 1.5923 | 2.4125 |
| 240 | 190.473 | 1.6535 | 2.5052 |
| 260 | 197.712 | 1.7141 | 2.5971 |
| 280 | 204.905 | 1.7742 | 2.6882 |
| 300 | 212.052 | 1.8338 | 2.7784 |
| 320 | 219.152 | 1.8928 | 2.8679 |
| 340 | 226.206 | 1.9513 | 2.9565 |
| 360 | 233.214 | 2.0093 | 3.0443 |
| 380 | 240.176 | 2.0667 | 3.1314 |
| 400 | 247.092 | 2.1236 | 3.2176 |
| 420 | 253.962 | 2.1801 | 3.3031 |
| 440 | 260.785 | 2.2360 | 3.3878 |
| 460 | 267.562 | 2.2913 | 3.4717 |
| 480 | 274.293 | 2.3462 | 3.5549 |
| 500 | 280.978 | 2.4006 | 3.6373 |
# Installation / Mounting
You can refer to this drawing for easy mounting in your printing environment:
# Wiring
TIP
Multiple PT100 amplifier boards can be connected together (daisy-chained). Simply insert the male daisy chaining connectors (J1) inside the female daisy chaining connection (J2) of your other PT100 amplifier board.
# Power supply selection
- The power supply should be chosen according to the logic tension of your controller.
- If you are daisy chaining more than one PT100 Analog Amplifier, only the first one should be connected to Vcc. For the other, connect only the signal pin (blue wire). If you have ground pins available near the analog inputs on your board, you can connect those too.
# PT100 Sensor Connection
- The PT100 Sensor must be connected to connector J3
- The connector mate with a PH3-3 connector from JST Sales Amarica Inc. or a standard dupont connector with a pitch of 100MIL.
# Controller Board Connection
| Cable Color | Connection |
|---|---|
| Red | Vcc |
| Blue | Signal |
| Black | GND |
- Connect Vcc wire to 3.3V or 5V depending on the logic tension use by your controller
- Connect the GND wire to a GND pin
- Connect the Signal wire to an analog input.
WARNING
Make sure not to use a thermistor input, since those pins usually have a pullup resistor and will not work with the PT100 Analog Amplifier
# Example for RAMPS 1.4
Signal input pins for RAMP 1.4 :
- A3
- A4
- A5
- A9
- A10
- A11
- A12
# Firmware
# Marlin Firmware
The PT100 Analog Amplifier is supported by the official distribution of Marlin since release 2.0.9.4
# Configuration.h
Configure the temperature sensor (lines 540-553):
#define TEMP_SENSOR_0 68
Add the following line to specify the pin use for the signal:
#define TEMP_0_PIN A3
# Maintenance
No maintenance required