WiFi Analog/Digital Module reads analog or digital data, returns the values and responds according to programmable limits. MQTT protocolDesigned by Snaptekk, Ships from Canada
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WE CAN CUSTOMIZE THE FIRMWARE TO MODIFY THE BEHAVIOR ACCORDING TO YOUR NEEDS, INCLUDING SUPPORTING PROTOCOLS LIKE MQTT, CONTACT US FOR PRICING AND DETAILS The analog/digital control module reads a...Read More…
WE CAN CUSTOMIZE THE FIRMWARE TO MODIFY THE BEHAVIOR ACCORDING TO YOUR NEEDS, INCLUDING SUPPORTING PROTOCOLS LIKE MQTT, CONTACT US FOR PRICING AND DETAILS
The analog/digital control module reads analog data and digital data through its 2 input terminals. Input analog data limits are zero VDC to 3.3VDC, and this maps into output values of 0 to 1024 Input digital data limits are zero, for a digital zero, and 3.3VDC for a digital 1 The module sends the value of the measured analog data periodically every Interval milliseconds, and it sends the value of the measured digital data when this chances from 0 to 1 or from 1 to 0. The user can also request the module to send the measured values of analog and/or digital data at any time by publishing a specific MQTT topic. The module provides a triggering signal whenever the digital data changes (Figure 1) The module provides a triggering signal when the analog signal is less than a preset value or larger than a preset value (Figure 2)
Once the module is connected to the WiFi router it will stablish communication with the MQTT server and port as specified above and will attempt to connect. Wait a few seconds and all 4 LEDs will blink in sequence indicating a successful connection. If this fails, reset the board and wait a few seconds for the LED sequence. The module uses MQTT protocol for communication. MQTT topics are composed of a four letter acronym followed by the ESP822 chipid (the chipid is listed with your documentation), XXXXchipid Once a connection with the MQTT sever is established, the module is ready for communication and therefore reading analog and digital data and sending commands.
A typical MQTT instruction is composed of a topic followed by a message.
MQTT Topics and Messages
Note that the analog value is sent by the module at regular intervals (controlled by the value of Interval_in_milliseconds) as specified during configuration or changed during operation, while the digital value is sent only when it changes. You can always request the analog or digital value at any time by publishing the respective topic.
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