Displays temperature as

• 20C = "NORMAL"
• < 20C = "NN COLDS", where NN = 20-T
• > 20C = "NN HOTS", where NN = T-20

A wedding present for Andrew and Kate.

• MSP430F449IPZ.
• Has a builtin LCD controller.
• http://www.ti.com/product/msp430f449
• Available from RS.

• Has many display components
  • 14 segment starburst, 7 digits, with 6 decimal points.
  • 7 segment, 4 digits, with 3 decimal points, and colon.
  • Battery meter.
  • Progress bar.
  • Antenna and 3 part signal strength meter.
  • Plus and minus signs.
  • 4 arrow signs.
• Because of the extra components, more than just having a set of 7 or 14 segment characters, we can implement a clock and a menu system.
• Available from http://microcontrollershop.com/

• MCP9700A
  • Analogue output
  • Vcc down to 2.3V

• Made at PCB Zone, http://pcbzone.net/

• 2 x AAA cells.

• With serial and LED disabled, power consumption has been measured at 25.8uA mean.
  • 13uA background
  • 60uA, 50us pulses, 3.9ms apart - this is the LCD clock.
  • 430uA, 170 us pulses, at 32Hz (31250us period) - this is the timer tick with short periods of 1MHz clock.
  • 510uA, 38ms pulses, at 0.5Hz (2000ms period) - this is the ADC being read every two seconds, along with the extra CPU and 1MHz clock activity.
  • Total power = 13 + 60*(50/3900) + 430*(170/31250) + 510*(38/2000) = 25.8uA
• With the batteries at 2.9V, one battery was removed. The unit ran for 30 minutes, with the capacitor supply voltage dropping to 2.25V.