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Card Transaction Processing PDF 
Larry has 8 years experience developing credit card reading machines and debit machines for use at the Point of Sale. He has detailed knowledge of the card processing regulations and the workings of transaction processors with certified applications with a number of the largest card transcation processors.

Devices connected directly to cash registers (integrated) and remotely via IP (internet) connection or dialup.

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Proximity Detector
Embedded-Eng has produced a low power, microcontroller based proximity detection system. The system uses a Cypress PSoC part to control a motor circuit and emitter/detector along with some user notification LEDs.