https://www.photonicsguy.ca/ 2026-04-06T20:52:22+00:00 https://www.photonicsguy.ca/ https://www.photonicsguy.ca/_media/wiki/dokuwiki.svg text/html 2014-11-13T18:50:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.photonicsguy.ca/projects/electronics/tirepressuresensor/code?rev=1415904614&do=diff Tire Pressure Sensor Code Return to Tire Pressure Sensor Project. ;############################################################################### ;# TITLE "Pressure Sense" ;# ;# Program : Pressure sensor using an MPX5700DP sensor and LCD display ;# Version :1.0 ;# Revision Date : ;# Author : Jeff Brown ;# ;# ;# ;############################################################################### ; radix hex #define RA0_… text/html 2014-11-13T18:50:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.photonicsguy.ca/projects/electronics/cardreader?rev=1415904614&do=diff Magtek Card reader MAGTEK 21045002 MagStripe card reader. [Datasheet] Single Track, only reads Track 2 2.7 to 5.5VDC When no card is present all pins are high. When a card is present pin 5 goes low and remains that way for 140ms after the entire card has been read. text/html 2014-11-13T18:50:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.photonicsguy.ca/projects/electronics/panelmeter?rev=1415904614&do=diff Panel Meter Interface Components * Panel Meter * [MCP41050] * [LM321] * [MAX5487 Digital Pot] * [12-bit DAC with SPI Interface] 1mA Full scale meter 94 Ohms coil resistance 5K Ohm resistor @ 5V = 1mA MCP4821 Pin No.SymbolFunction1VddSupply (2.7 to 5.5V)2CSChip Select3SCKSerial Clock Input4SDISerial Data Input text/html 2014-11-13T18:50:14+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.photonicsguy.ca/projects/electronics/serialconverter?rev=1415904614&do=diff Serial Converter MAX233CPP * Uses no external caps Cable Pinout Pin Wire Colour Description 1 N/C 2 Black RD (Data to PC) 3 Brown TD (Data from PC) 4 N/C 5 Red Ground 6 Orange DSR 7 Yellow RTS 8 Green CTS 9 N/C S Shield