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phone busy

Phone Busy Indicator

 

This simple circuit gives a clear indication when the phone is use - handy for those who still need dial-up for Internet access.

 

clock module

Tiny Real Time Clock (RTC) I2C module - DS1307 AT24C32 TE187

 

An article on a DS1307 based I2C module which can be used with Arduino programmable microcontrollers. These seem to be sold with non-rechargeable batteries, but charging circuitry for rechargeable batteries, which means some work is needed to improve the battery utilization.

 

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