PB Fortich

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  • Building Automation Shield

  • Created: Apr 03, 2017

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Automation nowadays is not limited to industrial application since it is now used in residential and commercial applications. A lot of people are now making use of this technology in which it brings convenience and resolves common problems in society. For this building automation shield circuit, it serves an additional option that accommodates universal application of building. It can also be used in industrial, commercial, and residential.

In this automation circuit, it make use of latching and non latching relays that are used to switch ON/OFF the device connected to the shield. These relays are connected to the relay drivers that receives data from the host controller. This host controller can be an arduino or ARM processor that will analyze data with respect to the configuration being set. The MAX11300+ is a PIXI device with 12-Bit ADC, 12-Bit DAC, analog switches, and GPIO that serves as a support of the host controller. It drives an 8-channel relay driver for the 4-20mA analog output I/Os while different ports are also provided and connected directly to MAX11300+ for 4-20mA analog inputs. The RTC and 1-wire device are interface to the host controller over the I2C bus while an EEPROM device is used for storage of calibration data for the 4-20mA loop. The bidirectional level translators provide level shifting required for data transfer between host controller and devices used in this automation circuit. The supply voltage and current are secured by synchronous step-down DC-DC converters and LDO regulators.

This design is useful for specific development of building automation. It is also suitable for control system applications with minor modification.



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