PTC Bricklet 2.0

Features

  • Supports Pt100 and Pt1000 sensors
  • Supports 2-wire, 3-wire and 4-wire type
  • Measures temperature with 0.5% accuracy at the full scale of -246 to 849°C
  • Resolution of 0.03125°C (15bit)

Description

The PTC Bricklet 2.0 can be used to extend the features of Bricks by the capability to measure temperature with Pt100 and Pt1000 sensors.

Pt100 and Pt1000 sensors of 2-wire, 3-wire or 4-wire type can be used.

The measured temperature can be read out in °C. With configurable events it is possible to react on changing temperatures without polling.

The PTC Bricklet 2.0 has a 7 pole Bricklet connector and is connected to a Brick with a 7p-10p Bricklet cable.

Technical Specifications

Property Value
RTD-to-Digital Converter MAX31865
Current Consumption 40mW (8mA at 5V)
   
Supported Pt-Sensor Types Pt100 and Pt1000 with 2-wire, 3-wire or 4-wire
Accuracy min 0.5% full scale
Input Protection +-50V
Temperature Resolution 0.03125°C (15bit)
Conversion Time 21ms
Fault Detection Open RTD element, RTD value out-of-range, short across RTD
   
Dimensions (W x D x H) 35 x 30 x 15mm (1.38 x 1.18 x 0.59")
Weight 9g

Resources

Jumper Configuration

Configure the jumper for Pt100/Pt1000 sensor and 2/3/4-wire type as shown below. The pins of the pin headers that are marked red have to be closed by a jumper for the corresponding sensor type.

PTC Bricklet 2.0 jumper configuration

Connectivity

See below for connection diagrams for 2/3/4-wire type resistance temperature device.

PTC Bricklet 2.0 connection diagram

Additionally the number of wires has to be set with the API.

Test your PTC Bricklet 2.0

To test a PTC Bricklet 2.0 you need to have Brick Daemon and Brick Viewer installed. Brick Daemon acts as a proxy between the USB interface of the Bricks and the API bindings. Brick Viewer connects to Brick Daemon. It helps to figure out basic information about the connected Bricks and Bricklets and allows to test them.

Connect the PTC Bricklet 2.0 to a Brick with a Bricklet Cable and attach a Pt100/1000 sensor (see picture below). In this example we use a 2-wire Pt100 sensor.

PTC Bricklet 2.0 connected to 2-wire Pt100 sensor

If you connect the Brick to the PC over USB, you should see a new tab named "PTC Bricklet 2.0" in the Brick Viewer after a moment. Select this tab. If everything went as expected the Brick Viewer should look as depicted below.

PTC Bricklet 2.0 in Brick Viewer

Put the sensor in your hand to see the temperature rising (or falling if it is extremely warm in your room).

After this test you can go on with writing your own application. See the Programming Interface section for the API of the PTC Bricklet 2.0 and examples in different programming languages.

Case

A laser-cut case for the PTC Bricklet 2.0 is available.

Case for PTC Bricklet 2.0

The assembly is easiest if you follow the following steps:

  • Screw spacers to the Bricklet,
  • screw bottom plate to bottom spacers,
  • build up side plates,
  • plug side plates into bottom plate and
  • screw top plate to top spacers.

Below you can see an exploded assembly drawing of the PTC Bricklet 2.0 case:

Exploded assembly drawing for PTC Bricklet 2.0

Hint: There is a protective film on both sides of the plates, you have to remove it before assembly.

Programming Interface

See Programming Interface for a detailed description.

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