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