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Model UU-1-E
ESP32 UniShield
(Base board v1-1 & Riser board v1-1. Updated April 2, 2022)
Description
This is a shield for ESP32 Development Board format interface designed by Espressif and
produced by different manufacturers. It is a stacked design, containing a “Base” board for I/O
and a “Riser” board for the interface. The ESP32 Development board (included) plugs on top of
the riser board and can easily be replaced. The riser and base boards are connected by ribbon
cable for efficient packaging.
It contains an on-board 3-amp DC:DC power supply (DDPS) to reduce the need for multiple
power supplies in the control panel. The DDPS can be powered with 12 or 24 VDC and its
output is adjustable from 3 to 12 VDC. Its output can be switched to either supply the interface
via its 5V pin or supply the inteface with 3.3V directly (thereby bypassing the interface's 5 V
regulator), or to supply an on-board terminal, creating a discrete DC-DC converter which can be
used for other devices such as flow-meters, RTD-amplifiers, etc.
The base board contains 24 high-current outputs (20 are usable with the ESP32) which are split
into two banks, enabling each bank to be powered by different sources (e.g. 5, 12, 24 VDC). The
current outputs limits are: 3 amps per output, 5 amps per driver (4 outputs each), 15 amps per
bank (2 banks). This will eliminate the need for electro-mechanical relays to switch low-current
DC. Therefore, contactors, valves, relays, DC pumps can be powered directly. This should
reduce panel space and simplify wiring, reducing panel size and overall cost. PWM functions at