- RTD Data Acquisition 8-Layer Stackable HAT for Raspberry Pi
- 24 bit delta-sigma A/D converters
- Factory accuracy: 0.1%
- Maximum accuracy (through calibration): 0.01%
- Maximum acquisition speed 40 cps
- Eight layer stackable to 64 RTD channels
- RS485/MODBUS transceiver
- Programmable threshold LEDs on all inputs
- Pluggable Connectors 26-16 AWG wires
- On-board hardware watchdog
- Reverse polarity power supply protection
- General Purpose Pushbutton
- On-board resettable fuse
- RTD DAQ Raspberry Pi
- Command line
- Python library
- Node-Red nodes
- Modbus RTU
- OpenPLC module
- Arduino Library
- Optional -50°C to 450°C PT100 sensors
Compatible with all Raspberry Pi versions from Zero to 4, the RTD Data Acquisition Card offers a compact and inexpensive solution for reading and storing data from up to 64 RTD-100 temperature sensors. Using 24 bit delta-sigma A/D converters with four channels each, the card achieves better than 0.1% accuracy. Field calibration with a precision 100Ω resistor can lead to 0.01% precision.
The card is compatible with all Raspberry Pi versions from Zero to 4. It shares the I2C bus using only two of the Raspberry Pi’s GPIO pins to manage all eight cards. This feature leaves the remaining 24 GPIOs available for the user.
- Four M2.5x18mm male-female brass standoffs
- Four M2.5x5mm brass screws
- Four M2.5 brass nuts
- Plug your card on top of your Raspberry Pi and power up the system
- Enable I2C communication on Raspberry Pi using raspi-config.
- Install the software from github.com:
- ~$ git clone https://github.com/SequentMicrosystems/rtd-rpi.git
- ~$ cd /home/pi/rtd-rpi
- ~/rtd-rpi$ sudo make install
The program will respond with a list of available commands.
Searching for multichannel temperature sensor reading device for building heating system automation I found this 8-channel RTD board and decided to try. Hardware is really good, reliable connections, robust stacking, good DIN rail mounting.
But what I really value is Sequent Microsystems support - in my lab I noticed that ADS1248 while switching between channels for a short moment is introducing noise into measurements. With help of SM engineers we found a way to recognise and eliminate those noisy measurements. And all this was done in a day, including new firmware version.
I have tens of channels in production using V5 boards and PT1000 sensors for about a year - works well, no issues. Monitoring data shows measurements are consistent and reliable.
I was looking for an RTD board to allow me to read temp sensors for a grain bin monitoring solution. The Sequent Microsystems RTD board is a good device to use for my project. To eliminate some value drifting I did have to replace the RTD type selection jumper with a soldered in jumper as the software information on this site recommends. Having the python and NodeRed node definitions to allow easy programming to access the data. I also had excellent response from Sequent Microsystems to any questions or issues I had with using this product.
I have used this for automating a brewery cellar system (24 fermenters) using this card, the relay card and Node Red.
Support has been fantastic with a small change I requested done in a matter of days.
I also like that the RTD's can be calibrated.
Other systems I've looked at have cost tens of thousands of $$ whereas this solution does the same for way under a grand.