I've got a bad habit of leaving things on breadboard for tinkering with later... but it never really gets finished. But this time I really do need to clear off a breadboard for something else. It uses an MSP430-F2012's internal temperature sensor. It seems to be a bit high in the room - I spotted keyword 'self-heating' mentioned elsewhere.
All eight bits of port 1 and two bits from port 2 are used to drive the display. It's not enough to give the decimal point so a transistor pulls the decimal point LED low when digit two is displayed.
Behind it is a TPS60121 to boost the two AAA cells up to 3.3V. The datasheet shows that it works down to 1.8V so hopefully I can use up 'flat' batteries in this application.
The TPS60121 was a nice and friendly TSSOP-20 package so I purchased boards to make it DIP-friendly and tiny SMD ceramic capacitors from RS components. All $2.09 worth of capacitors with free shipping. Crazy pricing.
All eight bits of port 1 and two bits from port 2 are used to drive the display. It's not enough to give the decimal point so a transistor pulls the decimal point LED low when digit two is displayed.
Behind it is a TPS60121 to boost the two AAA cells up to 3.3V. The datasheet shows that it works down to 1.8V so hopefully I can use up 'flat' batteries in this application.
The TPS60121 was a nice and friendly TSSOP-20 package so I purchased boards to make it DIP-friendly and tiny SMD ceramic capacitors from RS components. All $2.09 worth of capacitors with free shipping. Crazy pricing.
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