V0JT4 34 Posted February 5, 2012 Share Posted February 5, 2012 The goal of my project is to build ripple control receiver with some additional functions, main request was to receive massages and sent them via UART but current plan includes many more functions: - receive and decode messages - 4 relays triggered by certain message content - message logging to EEPROM with date and time from RTC - configuration will be stored on RTC DS1338 user memory - simple CLI via UART - 4 buttons and 20x4 character LCD interface - listing recorded messages with filtering Ripple control messages are transmitted to electricity distribution network, usually at 110kV or 22kV level and pass transformers down to end user 230V mains line. It is used to signal low and high tariff to electricity meters and high non-critical loads to optimize power distribution. The signal uses low modulation frequency, most common in Czech Republic is 216.7Hz. One message takes about 63 seconds to transmit. This allows one transmitter to cover large area. So far I'm getting around 200 messages a day with first receiver prototype. I plan to use these components: - MSP430G2553 - modified old receiver ZPA FMX-100 for signal extraction from mains, opto-coupled connection - AT24C512 I2C EEPROM, 64Kx8 bit - DS1338 I2C RTC - 20x4 character LCD HD44780 with shift register 74HCT164 - ULN2803 for relay switching with shift register 74HC595 - USB to UART module with FTDI or CP2102 chip, opto-coupled UART Does someone have good experience with DS1338 or would you recommend other RTC? I need 3.3V operation and battery backup, square wave output is welcomed. krzyk2 and roadrunner84 2 Quote Link to post Share on other sites
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