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 BASIC CIRCUIT - GENIE E18 PIC MICROCONTROLLER

V. Ryan 2010

 

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The circuits drawn below, were originally developed on Circuit Wizard software
 
The layout to the basic GENIE E18 PIC microcontroller circuit , is seen below.

The following components are required:

Download socket
4.5 to 6 volt power supply
Push switch, to be used as the reset switch.
Resistors - Three resistors - 4.7k, 22k and 100k.
Push switch.

ADDING AN INPUT
 
Adding and input requires further connections, as seen below.

A push switch (SW2) is added, with a 10k resistor, connecting to the 0v rail. There must also be a connection to the reset switch rail.

Further inputs can be added in the same way.
ADDING A LOW POWER OUTPUT
 
Outputs are added by simply connecting from an output, such as Q0, to a component such as an LED.

Further connections to the negative rail and the PR of the download socket are also made.
 
 
 
ADDING A HIGHER POWER OUTPUT VIA A TRANSISTOR
 
A relay can be connected to an output, by adding a 1k resistor, a MPSA14 (npn) darlington transistor, a diode and a 6v relay. This allows more powerful secondary circuits to be added. This example, shows the relay sharing the same 6volt power source, as the rest of the components.

The 1k resistor protects the transistor. The diode, arranged parallel to the relay, prevents back EMF, which would damage components such as the GENIE E18 microcontroller.
ADDING A SECOND POWER SOURCE
 
This example circuit shows how a second power source can be added.

In this case, a 12 volt battery pack has been included. This means that more powerful motors / solenoids can be added to the secondary circuit.

Using a primary circuit to activate a secondary circuit of this type, means that a low voltage circuit, such as a microcontroller, can activate more powerful secondary circuit and its components. The primary circuit is isolated from the secondary circuit by the relay. Consequently, is not damaged by the higher 12 volt power source.
 
 
 
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