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Arduino Serial State Temperature Cable Probes (ASSTP) drives Negative and Positive Temperature Coefficient (NTC & PTC; thermistors) probes on all available analog inputs, may display those on some I2C driven LCD display, and cycles a state machine that allows for remote controlling via serial port; e.g. using USB.
Two projects are combined for ASSTP:
and extended by extra serial commands to allow for remotely requesting values of the six temperatures cable probes (TPs).
For building the HEX file, the arduino Makefile is used. Clone or download / unzip to your system and configure the Makefile to your arduino board and where you have installed arduino Makefile type: make. Alternatively you can include all files of this project in your arduino IDE.
Wire your NTC probe with a matching (same resistor value as the probe) resistor in series; I used 10k NTC, so 10k Ohm. Wire from the mid (between your probe and your resistor) of this voltage divider to an analog input of your arduino; e.g. A0. Wire the 5 V system's volatage and GND to the ends of your voltage divider; one end is the selected resistor, the other the end of the NTC probe; done.
Here is some circuit:
However there are several public posts, blogs, and vlogs on internet showing schematic wiring diagram for breadboards; try searching for: NTC arduino; do not get iritated, the NTC lowers its resistance when heating up, so it is connected to 5 V, while runnig this code.
I also designed a PCB prototype shield for arduino UNO, and leonardo. It is in version:
It is keeping six NTC connectors, where five have cable glands for cabled NTC probes and the sixth has solder eyes for an internal NTC probe. There's a 5 mm heartbeat LED connected to PIN 13 (arduino's default / builtin SMD LED) for the serial state machine, where one can see the STATEs: constantly on - ERROR, heartbeat - IDLE, and flickering - processing some RUN MODE state currently.
Additionally theres a regulated power suppler, fed by up 18 V (even 37 V) that allows to regulated the volatage for electronics up to 5.87 V in maximum - to boost some device with 5.2 V to 5.4 V instead receiving 4.8 V from some weak usb hub.
Flash arduino, afterwards open a serial client, e.g. the serial monitor (press CTRL+SHFT+m) of your arduino IDE. arduino is in STATE: IDLE and waits for retrieving COMMANDS from you. COMMANDS have the syntax: <CMD_ID>; e.g. <2>, <3>, and so on; a listing of all COMMANDS is here. arduino will reply in IDLE to some of these COMMANDs; just try for.
However, for reading the temperature values of analog input A0, try:
For any other analog input: A1, A2, ,A5, try sending while in run MODE1: <41>, <42>, ..,<45>.
The extended COMMAND list by this project:
if arduino is processing in run MODE1; general COMMAND: <11>.
For more details, see coolSSATP.ino file as outer world usage example. For an own adapation, e.g. for driving another type / size of LCD display, take a look to the inner world, see the ASSTP.cpp and also coolATP.cpp as how to change things inside.
The following stable releases of ASSTP are available:
Try cloning (git checkout <SHA>) or download and unzip from release page.
I will use this project for driving several NTC probes in a home brewery system to monitor the temperatures independently, only using arduino and a 20x4 LCD display. The brewery automation is driven by a raspberry pi 2B running CraftBeerPi3. I am currently writing a python plugin for CBP3: craftbeerpi3ArduinoTempProbes using coolPSSM as a basis for communicating with arduino; coolPSSM is the python aquivalent that runs on ardiono as a basis coolASSM.
Everything was coded using:
have fun :-)