In the previous article of this series We learned to monitor temperature, and we also saw three distinct forms of refrigerate our Raspberry PI.
Any operating system, available for Raspberry PI they are susceptible to fail at any time, and if not turn them off properly probably will end up corrupting the SD card, or causing any electronic fault.
In addition to make regular backups, It is advisable to have an uninterrupted power supply system that it may prevent in the event of power failure to avoid losing the last days work or money invested in materials.
The SAI conventional are designed for desktops which consume much more than a Development Board, and that is why they tend to be expensive and many users opt to make their own SAI Home.
On the other hand are reaching the market specific solutions designed for Raspberry PI, but at the moment as well as faces are hard to get; and only allow its use to a single Raspberry.
I have chosen to consult with qualified professionals, and collaboratively have developed a SAI for this type of plates with a capacity to hold between three and six Raspberry PI for more than half an hour, expandable limits by replacing the battery with one that offers more mAh.
The electronic part of the SAI It has been designed by Juan Antonio Valverde, with components that Manuel of ComponentesOnline has given us, In addition to providing their experience giving a second opinion regarding the development of the same, We have also relied on specific revisions to the final design of Jordi Binefa.
To make our SAI you will only need a power supply and a battery LiPo both with an output voltage of 12V, a voltage converter of 12V to 5V, a couple of diodes rectifiers BY255 3A 1300V, and one Breadboard.
We'll begin by connecting the pole positive of the power supply to one of the tracks of the Breadboard, to channel the tension in the desired direction by a diode because thanks to the avoid battery to send power back into the power supply.
Now connect the second diode to channel from the source voltage and the battery to the inverter of voltage that will feed our Raspberry, It is very important to place the diodes in the position as in images; then connect the positive pole between the two battery diodes, and all the GND in a same track of our series Breadboard, I have chosen the of one side already what are precisely designed for this purpose.
In future installments, we will improve our SAI so I acted only in case of failure of the main power supply, i.e., transform it into a UPS offline.
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