Pages:  2. HI everybody! I'd like to read a RTD value from a PT sensor on my arduino with a max shield; The shield is not an original but a chinese copy buy on amazon or ebay I don't remember exactly; I try to test the example programme from adafruit and it doesn't work; The modification on the shield to adapt it at the 3wires sensor was done!
I try with different shield,sensor,cable and arduino board and it's always the same I don't know why I've seen somewhere a knowing probleme on this copy shield about a capacitor on the supply line; this capacitor maybe cause a drop down voltage and the guy remove it and replace it buy a bridge TomGeorge Design and Repair of industrial control systems.
Hi, Can you please post the code? Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png? Everything runs on smoke, let the smoke out, it stops running Hi The code is this one in example with the adafruit librairy Use Hi, Please read the first post in any forum entitled how to use this forum. Then look down to item 7 about how to post your code. It will be formatted in a scrolling window that makes it easier to read.
JPG 1. The Mega doesn't have the SPI pins on pins 11, 12 and 13 but on 51, 52 and 53! Edit your post 2 and insert code tags! Then I will have a look at it. Code: [Select]. Hi, If whte is gnd and red is supply.
Have you tried using 3. Sorry, my bad, thats a 3. Hi, Have you measured the resistances across the wires from the RTD? For 3 wire you should have two wires of the same colour and the other a different colour.However, when I print my output to Serial, I get some absurd answers - like the temperature is almost degrees Celsius. These are my serial print outs:. I checked the wiring and I believe that I had wired the thing correctly on the Photon.
Hi ScruffRthanks for the reply! Fixed that though! I measured the resistance between the two beforehand and it was very small, about 0. Have you tried 3v3 on the Photon to VIN on the shield?
I asked a similar question last week - PT MAX Temperature Sensor this veriy thread, after moving it back here - although now I have narrowed down the problem to a more specific topic. However, today I borrowed an Arduino to test it on. Same set-up, did not change the RTD breakout board or anything. When I ran the code in Arduino, it worked! When I checked the chart, they seemed to be correct: photon-pinout2. Thanks to ScruffR for moving these together. Looking at your photo above, I think you have wiring errors.
Sorry about the double topic - I thought since it was more specific about something else it warranted another one. Sorry about the lighting, I kept trying to angle it but the light from the board itself made it hard. The black wire is going to GND, the red wire is going to 3v3, and the white, yellow, green, and blue wire are going to 10 - 13 respectively. I did upload an updated picture though.
I also noticed that this is what the readRTD code does in the cpp file: Screen Shot at I had to use the hardware specialization instead. Use SPI on Particle Photon. My current code for reference: include "application. It is not clear where the teal colored wire connects. Screen Shot at Hey, I have the same issue but I couldnt understand what did you change?Today I would like to introduce a new breakout board to read temperature values from the most used sensors in the industry such as PT and PT well at least in France.
I wanted this board to be small and efficient and the ability to measure all PT ot PT sensors, the one with 2, 3 or 4 wires. So I added several on board jumper pad to select the different mode. But you can also find it on several Arduino boards, even if pining may be different.
You just need to do some wiring if the NRF24L01 connector is not on the board. Following can be called a getting started section, I will describe how the board is made and how to use it.
Nothing fancy, this design is very close from the original Maxim MAX datasheet. Features are following :. So there are 8 pins, described as follow and this is the same pinout for the MAX breakout board divided into 3 groups. If you want the demo sketches do works, you need to connect the pin according to the definition above. Mainly you can have 2 values type of sensor, PT and PT and for each 3 connections type, which are 2,3 or 4 wires.
How to Play with PT100 Sensors
Here are the different options that are present on the bottom of the board. You will find in the picture below how to setup the board. You will need the modified MAX Arduino library to be able to test the board. The library can be found on my github here.
If you want to connect an optional OLED display you will also need the u8glib library. Theses two sketches are setup for PT 2 wires, is you want to use PT you need to change the following definition. For those who wants to buy the already made board, you can do it on my tindie shop. MAX board. MAX breakout board. MAX breakout board schematic. NRF24L01 Pinout top.
PT100 and PT1000 Breakout Board with MAX31865
MAX breakout board pinout. PT 2 Wires.Recently I came across a bundle of PT temperature sensors after a long timeand wanted to build a temperature sensor device with the help of an Arduino. Luckily, after a bit of searching around, I found some awesome documents that explains the problem and provides practical solutions.
Well, let me share my thoughts and findings here which may help you to proceed with your own PT DIY projects. When it comes to measuring temperature, most hobbyists may be think of a cheap thermistor first. Most resistance temperature detectors RTDs have higher accuracy and repeatability than thermocouples, and consist of a fine wire typically platinum wrapped around a ceramic core, exhibiting a linear increase in resistance as temperature rises. RTDs come in 2-wire, 3-wire or 4-wire versions.
The 2-wire RTD signal is affected by the distance to the controller, but 3-wire or 4-wire RTDs can compensate for line losses. Unlike thermocouples, special connection cables are not very necessary for PT sensors.
However, the probe and cable should be chosen carefully to suit the specific application. Host interface of the module consists of total 8 connection terminals as pointed below. Before the first use, you need to put some solder on the solder jumpers to select which type of sensor you want to connect on.
Solder Jumper configurations greenish marks for a standard 2-wire PT1oo sensor is shown below. The module also holds an onboard 3V regulator, and provides an analog output for further processing by an external microcontroller.
Ofcourse you can try other methods to build a thermometer using PT as the temperature sensor. The readings can then be routed through SPI interface to a microcontroller coded to perform interpolation that converts resistance to temperature using ITS scale see the basic circuit idea shown below.
However, to get that precision and accuracy out of your PT RTD you must use an amplifier that is designed to read the low resistance. Better yet, have an amplifier that can automatically adjust and compensate for the resistance of the connecting wires.
We have some example code that will calculate the temperature based on the resistance for you. We even made the breakout 5V compliant, with a 3. Each order comes with one assembled RTD amplifier breakout board. Also comes with two 2-pin terminal blocks for connecting to the RTD sensor and pin header to plug into any breadboard or perfboard.
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PT100 RTD Temperature Sensor Amplifier - MAX31865
Maker Business — To make it through a tough business cycle, layoffs should be a last resort Wearables — Dialing brightness back Electronics — Soldering Pointer! Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.Forgot your password? Create Account. Close menu. Your cart. Close Cart. Description: Resistance temperature detectors RTDs are temperature sensors that contain a resistor that changes resistance value as its temperature changes, basically a kind of thermistor.
We have some example code that will calculate the temperature based on the resistance for you. We even made the breakout 5V compliant, with a 3. Each order comes with one assembled RTD amplifier breakout board. Description Delivery Review Description: Resistance temperature detectors RTDs are temperature sensors that contain a resistor that changes resistance value as its temperature changes, basically a kind of thermistor.
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Email Cancel. Compare box is empty!For precision temperature sensing, nothing beats a Platinum RTD. Resistance temperature detectors RTDs are temperature sensors that contain a resistor that changes resistance value as its temperature changes, basically a kind of thermistor.
However, to get that precision and accuracy out of your PT RTD you must use an amplifier that is designed to read the low resistance. Better yet, have an amplifier that can automatically adjust and compensate for the resistance of the connecting wires. We've carried various MAXIM thermocouple amplifiers and they're great - but thermocouples don't have the best accuracy or precision, for when the readings must be as good as can be. We have some example code that will calculate the temperature based on the resistance for you.K-type thermocouple + MAX6675 to measure high temperatures (°C/°F) using Arduino
We even made the breakout 5V compliant, with a 3. Each order comes with one assembled RTD amplifier breakout board. But we stock them in the shop. Some soldering is required to solder the headers and terminal blocks to the breakout, but it's an easy task with soldering tools. Please note: this does not include an RTD sensor! Payment Shipping Refund Payment. We accept PayPal only. Payment must be received in 5 business days of auction closing. Please leave note for your special request e.
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