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The MLX90615 is a miniature infrared thermometer for non-contact temperature measurements. Both the IR sensitive thermopile detector chip and the signal conditioning ASIC are integrated in the same miniature TO-46 can.
The infrared thermometer comes factory calibrated with a digital SMBus output giving full access to the measured temperature in the complete temperature range(s) with a resolution of 0.02 °C. The sensor achieves an accuracy of ±0.2°C within the relevant medical temperature range. The user can choose to configure the digital output to be PWM.
Features and benefits
Factory calibrated in wide temperature range: -20 to 85°C for sensor temperature and -40 to 115°C for object temperature
High accuracy of 0.5°C over wide temperature range (0..+50 C for both Ta and To)
Medical accuracy of 0.2°C in a limited temperature range
Measurement resolution of 0.02°C
SMBus compatible digital interface for fast temperature readings and building sensor networks
Customizable PWM output for continuous reading
3V supply voltage with power saving mode
Parts List
Layout
Code Example
This particular example comes from the following library which I installed – https://github.com/skiselev/MLX90615
I had issues with one of the other libraries – this one works just fine
#include <Wire.h>
#include <mlx90615.h>
MLX90615 mlx = MLX90615();
void setup()
{
Serial.begin(9600);
Serial.println("Melexis MLX90615 infra-red temperature sensor test");
mlx.begin();
Serial.print("Sensor ID number = ");
Serial.println(mlx.get_id(), HEX);
}
void loop()
{
Serial.print("Ambient = ");
Serial.print(mlx.get_ambient_temp());
Serial.print(" *C\tObject = ");
Serial.print(mlx.get_object_temp());
Serial.println(" *C");
delay(500);
}
Output
Open the serial monitor and you should see something like this. I moved a hot object near the sensor when the second value increased
Links
https://www.melexis.com/-/media/files/documents/datasheets/mlx90615-datasheet-melexis.pdf
This TSL2561 is an I2C light-to-digital converter TSL2561 that transforms light intensity to a digital signal. The TSL2561 features a selectable light spectrum range due to its dual light sensitive diodes: infrared and full spectrum. You can switch among three detection modes to take your readings. They are infrared mode, full spectrum and human visible mode.
When running under the human visible mode, this sensor will give you readings just close to your eye feelings.
Features
Selectable detection modes
High resolution 16-Bit digital output at 400 kHz I2C Fast-Mode
Wide dynamic range: 0.1 – 40,000 LUX
Wide operating temperature range: -40°C to 85°C
Programmable interrupt function with User-Defined Upper and lower threshold settings
Here is a typical module that makes it easier to work with the sensor
Layout and Connection
Code
We use this as a basis – https://os.mbed.com/users/anhnt2407/code/TSL2561_Light_sensor/
Update the tsl2561.h for STM32 nucleo
#define TSL2561_I2C_PINNAME_SDA PB_9
#define TSL2561_I2C_PINNAME_SCL PB_8
#include "mbed.h"
#include "TSL2561.h"
Serial PC(USBTX, USBRX);
#define PC_PRINTX(z,x) if(z==1) PC.printf(x);
#define PC_PRINTLNX(z,x) if(z==1) {PC.printf(x); PC.printf("\r\n");}
#define PC_PRINTXY(z,x, y) if(z==1) PC.printf(x, y);
#define PC_PRINTLNXY(z,x, y) if(z==1) {PC.printf(x, y); PC.printf("\r\n");}
DigitalOut myled(LED1);
TSL2561 tsl2561(TSL2561_ADDR_FLOAT);
Timer setuptimer;
Timer executetimer;
void setup(void){
if (tsl2561.begin()) {
PC_PRINTLNX(1,"TSL2561 Sensor Found");
} else {
PC_PRINTLNX(1,"TSL2561 Sensor not Found");
}
// You can change the gain on the fly, to adapt to brighter/dimmer tsl2561 situations
tsl2561.setGain(TSL2561_GAIN_0X); // set no gain (for bright situtations)
tsl2561.setTiming(TSL2561_INTEGRATIONTIME_402MS); // longest integration time (dim tsl2561)
// Now we're ready to get readings!
}
int main() {
PC_PRINTLNX(1,"----------START-------------");
setuptimer.start();
setup();
setuptimer.stop();
PC_PRINTLNXY(1,"Setup time: %f",setuptimer.read());
setuptimer.reset();
uint16_t x,y,z;
while(1) {
executetimer.start();
x = tsl2561.getLuminosity(TSL2561_VISIBLE);
y = tsl2561.getLuminosity(TSL2561_FULLSPECTRUM);
z = tsl2561.getLuminosity(TSL2561_INFRARED);
executetimer.stop();
PC_PRINTLNXY(1,"Visible: %d",x);
PC_PRINTLNXY(1,"Full Spectrum: %d",y);
PC_PRINTLNXY(1,"Infrared: %d",z);
PC_PRINTLNXY(1,"Execution Time: %f",executetimer.read());
executetimer.reset();
// wait(1);
PC_PRINTLNX(1,"----------COMPLETE-------------");
}
}Testing
Using a terminal program like teraterm you should see something like this
 tsl2561 output
Links
Free Shipping 1pcs GY-2561 TSL2561 Luminosity Sensor Breakout infrared Light Sensor module integrating sensor AL
In this example we connect an LM75 to a STM32 Nucleo and we will use the MBEd compiler
The LM75 temperature sensor includes a delta-sigma analog-to-digital converter, and a digital overtemperature detector. The host can query the LM75 through its I²C interface to read temperature at any time. The open-drain overtemperature output (OS) sinks current when the programmable temperature limit is exceeded.
The OS output operates in either of two modes, comparator or interrupt. The host controls the temperature at which the alarm is asserted (TOS) and the hysteresis temperature below which the alarm condition is not valid (THYST). Also, the LM75’s TOS and THYST registers can be read by the host.
The address of the LM75 is set with three pins to allow multiple devices to work on the same bus. Power-up is in comparator mode, with defaults of TOS = +80°C and THYST = +75°C. The 3.0V to 5.5V supply voltage range, low supply current, and I²C interface make the LM75 ideal for many applications in thermal management and protection.
Key Features
SO (SOP) and µMAX® (µSOP) Packages
I²C Bus Interface
Separate Open-Drain OS Output Operates as Interrupt or Comparator/Thermostat Input
Register Readback Capability
Power-Up Defaults Permit Stand-Alone Operation as a Thermostat
3.0V to 5.5V Supply Voltage
Low Operating Supply Current 250µA (typ), 1mA (max)
4µA (typ) Shutdown Mode Minimizes Power Consumption
Up to Eight LM75s Can Be Connected to a Single Bus
Layout
I2C device you can power it from 3.3 or 5v
 stm32nucleo and lm75
Code
I used this library – https://os.mbed.com/users/chris/code/LM75B/
#include "mbed.h"
#include "LM75B.h"
LM75B tmp(I2C_SDA, I2C_SCL);
Serial pc(SERIAL_TX, SERIAL_RX);
int main ()
{
while (1) {
pc.printf("%.2f celsius\r\n",tmp.read());
wait(1.0);
}
}
Output
Using a serial terminal program you should see something like this
 lm75 output
Links
LM75 temperature sensor high speed I2C interface high precision development board module
In this example we connect an MS5611 to an STM32 Nucleo – in this case it was a Nucleo-F446RE
This barometric pressure sensor is optimized for altimeters and variometers with an altitude resolution of 10 cm. The sensor module includes a high linearity pressure sensor and an ultra-low power 24 bit ΔΣ ADC with internal factory calibrated coefficients. It provides a precise digital 24 Bit pressure and temperature value and different operation modes that allow the user to optimize for conversion speed and current consumption. A high resolution temperature output allows the implementation of an altimeter/thermometer function without any additional sensor.
Features
- High resolution module, 10 cm
- Fast conversion down to 1 ms
- Low power, 1 µA (standby < 0.15 µA)
- QFN package 5.0 x 3.0 x 1.0 mm3
- Supply voltage 1.8 to 3.6 V
- Integrated digital pressure sensor (24 bit ΔΣ ADC)
- Operating range: 10 to 1200 mbar, -40 to +85 °C
- I2C and SPI interface up to 20 MHz
- No external components (Internal oscillator)
- Excellent long term stability
Connection
| ST32 Nucleo |
Module connection |
| 3v3 |
Vcc |
| Gnd |
Gnd |
| SCL |
SCL |
| SDA |
SDA |
Here is a layout
 stm32nucleo and ms5611 Code
Import this into the MBEd compiler – https://os.mbed.com/teams/Aerodyne/code/MS5611Example/
I slightly modified to loop the output, thats about it
/* MS5611 Pressure sensor example
Aerodyne Labs
2014
*/
#include "mbed.h"
//Only uncomment the one needed.
//#include "MS5611SPI.h"
#include "MS5611I2C.h"
int main() {
//Only uncomment the I2C or SPI version.
//MS5611SPI ms5611(p11, p12, p13, p10);
//MS5611I2C ms5611(p9, p10, false);
//PB_9 and PB_8 for Nucleo boards
MS5611I2C ms5611(PB_9, PB_8, false);
//Print the Coefficients from the
ms5611.printCoefficients();
while(1) {
printf("Pressure = %.0f Pa \r\n", ms5611.getPressure());
printf("Temperature = %.2f degC \r\n", ms5611.getTemperature());
printf("Altitude = %.2f m \r\n", ms5611.getAltitude());
printf("-------------------\r\n");
wait(2.0f);
}
}
Output
Use a program like teraterm and you should see something like this
 ms5611 output
Link
GY-63 MS5611-01BA03 Precision MS5611 Atmospheric Pressure Sensor Module Height Sensor Module
A common display module that you can buy on the internet contain the Tm1638 driver chip, I was interested in this one which is the TM1637 which appears to be a more basic version which can only control a display, the TM1638 can also control LED’s, buttons and two displays at the same time.
This is a common anode 4-digit tube display module which uses the TM1637 driver chip; Only 2 connections are required to control the 4-digit 8-segment displays
Here is the module
Features of the module
Display common anode for the four red LED
Powered supply by 3.3V/5V
Four common anode tube display module is driven by IC TM1637
Can be used for Arduino devices, two signal lines can make the MCU control 4 8 digital tube. Digital tube 8 segment is adjustable
Here is how to hook the module up, the good news is this worked with my Arduino Due and 3.3v
Schematic
 arduino due and TM1637
Code
There is a library for this IC, you can get it from https://github.com/avishorp/TM1637 , as usual there is a built in example but here is a simple sketch
#include <TM1637Display.h>
const int CLK = 3; //Set the CLK pin connection to the display
const int DIO = 2; //Set the DIO pin connection to the display
int numCounter = 0;
TM1637Display display(CLK, DIO); //set up the 4-Digit Display.
void setup()
{
display.setBrightness(0x0a); //set the diplay to maximum brightness
}
void loop()
{
for(numCounter = 0; numCounter < 1000; numCounter++) //Iterate numCounter
{
display.showNumberDec(numCounter); //Display the numCounter value;
delay(1000);
}
}
Links
1pcs SAMIORE ROBOT 4 Bits TM1637 Red Digital Tube LED Display Module & Clock LED
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