### DESCRIPTION

The E2S_IoT_Temperature_Transmitter (E2S_IoT_TT) was designed to monitoring the temperature in the coolers and freezers of a food distribution company, where they preserve a large number of products, and it is vital to have a control over the conditions. It also can be used in another kind of industrial applications like pharmaceutical companies or any other company that requires temperature monitoring for perishable products. This is the first version of the module.

Many companies rely on this kind of devices to acquire data on the conditions of their products. However, there are many places where still are using local instruments which can be very limited to take corrective actions in case some event occurs. Due to the connection to the internet, alerts, text messages, and e-mails can be sent when some events are present. Moreover, some control could be done if the module is equipped whit the necessary modules. Nowadays, this kind of devices can help to save time and money.  

### TECHNICAL DETAILS / COMPONENTS

The “brain” of the E2S_IoT_TT is the powerful ARM Cortex M4 STM32F303K8Tx which can run up to 72MHz (90DMIPS), 64 KB of flash memory, and 12 KB of SRAM. It is also equipped with the ESP07 for WiFi connection. This module was selected, among all the options in the ESP8266 based modules, since it has an uFL antenna connector and the range for industrial applications needs to be extended as much as possible. It is known that this module can act as the main microcontroller, but for this case, it is limited in the number of I/O pins.

The Microchip RN4871 Bluetooth module was added to ease the configuration or setting some parameters of the module once installed. The initial configuration of the board can be done during programming or through the serial port of the ESP07. However, sometimes after the installation of the module in the place where it will be working, some troubleshooting or reconfiguration is needed. For situations like this, the Bluetooth module is very helpful to rewrite some parameters like SSID or password of the WiFi network or select resolution of the temperature sensor. Usually, modules like this one are installed in difficult access areas and working with a laptop in such areas to reconfigure or re-flash the module can be a tedious process.

The temperature sensor selected for the module was the DS18B20. It is a versatile sensor which allows connecting multiple sensors in the same bus. It provides digital temperature readings that makes easy to install them in long distances. Also, it offers different resolution readings.

For booth wireless modules, the board is equipped with jumpers to select the communication to the microcontroller and to an external device (laptop or computer) to perform the initial configuration. The position of the jumpers is described on the table printed on the board.

An LCD display was added in case some parameters are required to be read locally.

Some pin headers with access to the GPIO pins of the microcontroller were added in case some other modules or devices are required to be tested or added to the project.

### LEARN / TOPIC / BUILD INSTRUCTIONS

Yet this module is still in a developing face, it can provide all the necessary tools for the purpose it was designed. Moreover, it can be used as a training board for other general-purpose electronic projects since its features allow integration with many other kinds of applications.