1818281+1818282 Microchip Technology, 1818281+1818282 Datasheet - Page 33

• Manufacturer Part Number: 1818281+1818282
• Description: EDF / AMICUS18 + SHIELD, BUNDLE
• Manufacturer: Microchip Technology
• Type: Development Boardr

Specifications of 1818281+1818282

• Kit Contents: Board
• Svhc: No SVHC (15-Dec-2010)
• Kit Features: Nine 10-bit ADC Inputs, Two 10-bit PWM Outputs, Two Comparators
• Mcu Supported Families: PIC18F25K20
• Silicon Manufacturer: Microchip
• Core Architecture: PIC
• Core Sub-architecture: PIC18
• Silicon Core Number: PIC18F
• Silicon Family Name: PIC18FxxKxx

Amicus18 Companion Shield
Light Level Switch (Cockroach Mode)
We can use the ADC for a more practical example now that we know it works. We’ll use an LDR (Light
Dependant Resistor) as the input to the ADC, and turn on an LED when the light level drops beyond a
certain level.
An LDR, as it’s name suggests, alters it’s resistance depending on the amount of light falling upon it. It’s
one of the oldest methods of light detection, and one of the simplest of all light level detectors to use,
and one of least expensive.
And LDR layout is shown below:
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Version 1.0
06-10-2009