Raspberry Pi UPS and Isolated 4 Input +4 Output +3 ADC +RTC BoardDesigned by ARMtronix in India
What is it? This device is made specially for Raspberry Pi. It has functions like isolated digital inputs/outputs and analog inputs. It can take 12-24V DC wide input and regulates it to required vo...Read More…
This device is made specially for Raspberry Pi. It has functions like isolated digital inputs/outputs and analog inputs. It can take 12-24V DC wide input and regulates it to required voltage for raspberry pi, that means user can use industry standard 24V DC to powerup the Pi using this board. It also has li-po charger on-board to charge a single Li-Po cell, the same can act as power back up to Pi. It has special feature of RESTART button onboard and also can be connected using RMC externally. It has few salient features like mains power input presence detection and battery voltage monitoring. Battery backup and above features will help user, where user wants to save the existing instant data and turn off Pi by soft shutdown in case of mains power failure. It has an RTC with its dedicated button-cell to help logging data with time stamp for the purpose of analysis.
This boards board comes in 2 variants mentioned below. Variant can be chosen while purchasing based on your application and planned way of implementation. It has 4 isolated digital inputs to monitor 4 digital sensors, has 4 isolated digital outputs to control 4 digital outputs like relays and 3 analog 4-20mA current inputs. All the inputs and outputs can be monitored and controlled simultaneously.
Board has 2 variants as mentioned below:
Variant 1 :Board with suitable special 40Pin male-female header soldered from the bottom side of the board in-compatible to stack up on Raspberry Pi. So that user can directly plug it on to Pi and use it for their application. Will occupy less space (length or width) but more height or depth.
Variant 2 :Board with 40 Pin Male header and respective FRC with box header to connect with Raspberry pi, instead of stack up. This will be useful where users cannot stack up on to Pi, they opt for this option. This variant connection will occupy more space (length or width) but less height or depth.
Buck Converter The DC-DC converter on board is used to regulate voltage from 24 V DC to 12 V DC to 5 V DC to supply power to Raspberry-Pi. The main power input 24V DC supply is also used to provide limited/controlled power to isolated outputs.
Boost Converter: This board can be powered ON using external Li-Po battery. Pi works on 5V DC whereas we get only 4.2 V maximum from Li-Po battery. To convert this li-po battery output to required supply voltage for Pi, this booster circuit is included in this board. The booster we have used in this product is MT3608, it can boost battery output to required power for Pi which kind of acts as part of the USP.
Isolated Digital Inputs – 4 Numbers There are four number of optically isolated inputs given accessible to user to monitor sensors or read any digital inputs with voltage level between 12V DC – 24V DC. The optical isolation is used to protect the hardware from any electrical hazardous at/from external interfaces to the board like sensor push buttons or any other respective inputs.
Isolated Digital Inputs for Input Power Presence There is one isolated input connect to the pis gpio which can be used to detect input from 12-24 V DC source and inform pi (if a script /program is used ) that there is no input , this feature along the booster part can be used to shutdown pi properly without corrupting the flash /os of pi . This feature is very helpful in an industrial environment where pi is used .
Isolated Digital outputs – 4 Numbers There are four number of optically isolated outputs given accessible to user to control low power consumption loads with voltage level between 12V DC – 24V DC. The optical isolation is used to protect the hardware from any electrical hazardous at/from external interfaces to the board like solenoids, relays or any other respective outputs.
Analog Inputs -3 + (1 used to monitor battery voltage): As mentioned above, this board also supports for Analog input measurement for monitoring sensors with analog output from 4-20mA DC. The ADC used in this board is ADS1115 from Texas Instruments. Communication between Pi and this ADC is I2C. For more information on this ADC, please refer to it technical datasheet from its manufacturer at http://www.ti.com/lit/ds/symlink/ads1115.pdf
Real Time Clock. Real Time Clock on this board is DS1307 from Maxim Semiconductor. Communication between Pi and this RTC is I2C. For more information on this RTC, please refer to it technical datasheet from its manufacturer at https://datasheets.maximintegrated.com/en/ds/DS1307.pdf
Mechanical Specification: Mechanical Dimensions of PCB are 85 x 60 x 12 mm (Length x Width x Height)
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