Thermostat 6 Click

How does it work?

Thermostat 6 Click is an add-on board designed for precise temperature monitoring and control of external devices. At its core, it features a temperature probe connector for integrating an NTC thermistor or other RTD probe to measure temperature variations. The MCP6022 processes the probe’s signal, a rail-to-rail input/output operational amplifier from Microchip, ensuring high precision and reliability in temperature monitoring. Besides accurate temperature measurement, this board also has an onboard trimmer for setting the desired operating temperature range between 5°C and 30°C. That’s why this board is highly adaptable for various applications in industrial automation, HVAC systems, and other temperature-sensitive environments.

The probe detects real-time temperature changes, while the trimmer allows users to define a threshold temperature level. By comparing the probe’s readings to the set threshold, the board activates or deactivates its relay, the AZ9403-1C-5DE SPDT from Zettler, enabling precise and automated control of external devices based on temperature conditions. The temperature limit set by the onboard trimmer can be monitored as an analog voltage output through the AN pin of the mikroBUS™ socket.

The AZ9403-1C-5DE SPDT relay has a nominal coil voltage of 5VDC and a contact current rating of 10A, enabling it to control more powerful external devices. The relay’s SPDT configuration offers flexibility in switching between normally open (NO) and normally closed (NC) positions while its activation is controlled via the RLY pin of the mikroBUS™ socket. An orange LED indicates the relay’s operational status visually, ensuring clear feedback and easy monitoring.

The analog temperature value processed by the operational amplifier is directly digitized by the MCP3221 A/D converter, enabling precise digital monitoring of the temperature. This 12-bit resolution converter communicates with the host MCU via an I2C-compatible interface, providing accurate and reliable temperature data for further processing.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VCC SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used as a reference for further development.

Specifications

Pinout diagram

This table shows how the pinout on Thermostat 6 Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns).

Notes	Pin					Pin	Notes
Analog Output	AN	1	AN	PWM	16	RLY	Relay Control
	NC	2	RST	INT	15	NC
ID COMM	CS	3	CS	RX	14	NC
	NC	4	SCK	TX	13	NC
	NC	5	MISO	SCL	12	SCL	I2C Clock
	NC	6	MOSI	SDA	11	SDA	I2C Data
Power Supply	3.3V	7	3.3V	5V	10	5V	Power Supply
Ground	GND	8	GND	GND	9	GND	Ground

Onboard settings and indicators

Thermostat 6 Click electrical specifications

Software Support

Thermostat 6 Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK‘s open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Example Description

This example demonstrates the use of Thermostat 6 Click board by reading the temperature level set using an on-board potentiometer and the temperature from the NTC Thermistor 10k Cylindrical Probe (B57500M0103A005) which is connected to the input, and also displaying the relay state. If the set temperature level is lower than the temperature read from NTC, then the relay switches ON.

Key Functions

• thermostat6_cfg_setup Config Object Initialization function.
• thermostat6_init Initialization function.
• thermostat6_get_adc_v_avg This function reads and averages the ADC voltage for a desired number of samples.
• thermostat6_get_an_pin_v_avg This function reads and averages the AN pin voltage for a desired number of samples.
• thermostat6_get_temperature This function calculates temperature in degrees Celsius based on a voltage input using the NTC Thermistor 10k Cylindrical Probe (B57500M0103A005) R/T characteristics map.

Application Init

Initializes the driver and logger.

Application Task

Reads the temperature level set using an on-board potentiometer and the temperature from the NTC Thermistor 10k Cylindrical Probe (B57500M0103A005) connected to the input, and displays the relay state. If the set temperature level is lower than the temperature read from NTC, then the relay switches ON.

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output – Use the “Application Output” window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal – Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.