Summary of Relais Board Using AT2313
This article describes a 4-relay peripheral board designed for the AT2313 Project. It features an ML10 connector, a ULN2803A IC with built-in protection diodes, four LEDs with current-limiting resistors, and four 2-pole screw connectors. The board operates at 5A/250V per relay and requires no external diodes for driving.
Parts used in the Relais Board Using AT2313:
- ML10 output connector
- ULN2803A integrated circuit
- Four LEDs
- Current limiting resistors
- Four 2-pole screw connectors
- AT2313 Project board
Description
This is a peripheral board with 4 relais, rated at 5A/250V each. The board has a ML10 output connector for connection with the AT2313 Project board. It has also 4 LED’s for indication which relais is switched on.
Hardware
The circuit is simple, it consists of no more then an ML10 connector, a ULN2803A, which contains eight open collector darlington transistors, four of them amplifies the signals that come from the microcontroller. The IC has build in protection diodes, so no external diodes for driving the relais are needed. There are also four LED’s with current limiting resistors to indicate if a relais is energized, each output of the relais goes to a 2-pole screw connector.
For more details, click: Relais Board Using AT2313
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What is the purpose of this peripheral board?
It is a board with 4 relays rated at 5A/250V each for connection with the AT2313 Project board. -
How does the board indicate which relay is switched on?
The board has 4 LEDs that provide indication when a relay is energized. -
Does the ULN2803A require external diodes for driving relays?
No, the IC has built-in protection diodes so no external diodes are needed. -
What component amplifies the signals from the microcontroller?
The ULN2803A contains eight open collector darlington transistors where four amplify the signals. -
How are the relay outputs connected to external devices?
Each output of the relay goes to a 2-pole screw connector. -
What connector is used to link this board to the AT2313 Project board?
An ML10 output connector is used for the connection.
