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Very cool and inspiring. I'm doing something similar [1] by replacing the guts of a Toshiba Libretto 50C (a tiny laptop from 1996) with a Raspberry Pi and upgra

by jsherer 12y ago

Very cool and inspiring. I'm doing something similar [1] by replacing the guts of a Toshiba Libretto 50C (a tiny laptop from 1996) with a Raspberry Pi and upgrading its screen to a 7" widescreen. It's slightly larger than your terminal, but in my opinion, will be much more usable as a PC with the larger keyboard. But, to each his own :) What kind of battery life do you get with your machine? [1]: http://restoringmylibretto.tumblr.com/ http://restoringmylibretto.tumblr.com/

pjc50 12y ago
The Libretto runs linux, or at least used to. I have a libretto 30 on a shelf somewhere :)
- jsherer 12y ago
  Indeed! But, a broken one does not :)
TimGremalm 12y ago
Estimated 8.6h with idle CPU, based on my calculations. Raspberry Pi A+ 0.52W usage at 100ma 5.2V on CPU idle (http://raspi.tv/2014/raspberry-pi-a-how-much-power-does-it-need http://raspi.tv/2014/raspberry-pi-a-how-much-power-does-it-n...) Adafruit PiTFT - 2.8" Raspberry Pi Touchscreen with full-on backlight the current draw is ~100mA. (http://www.adafruit.com/product/1601 http://www.adafruit.com/product/1601) 0.15=0.5W Powerconsumption of Rpi and TFT should be 1.02W at idle. PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost @ 500mA+ (http://www.adafruit.com/product/1944 http://www.adafruit.com/product/1944) 2.500Ah 3.7V LiPo 3.7V2.5Ah=9.25Wh Boosted to 5V at 95% efficiency 8.79Wh 8.79Wh/1.02W = 8.6h *Edit: I did a mistake when I calculated the Watt-hour. The Watt-hours of the battery can't increase just because the voltage increases, changed it.
- jsherer 12y ago
  You should let it run idle and see how long until the battery is depleted. I underestimated the losses due to efficiency with my Libretto project (boost converters run at different efficiencies depending on the power draw). I was able to get about 4 hours on a 6600mAh battery pack powering a Pi and a 7" touchscreen with wifi and bluetooth enabled (the project draws about 8W when the screen is turned on, about 5W with it turned off).

by jsherer 12y ago

pjc50 12y ago

The Libretto runs linux, or at least used to. I have a libretto 30 on a shelf somewhere :)

jsherer 12y ago
Indeed! But, a broken one does not :)

TimGremalm 12y ago

Estimated 8.6h with idle CPU, based on my calculations. Raspberry Pi A+ 0.52W usage at 100ma 5.2V on CPU idle (http://raspi.tv/2014/raspberry-pi-a-how-much-power-does-it-need http://raspi.tv/2014/raspberry-pi-a-how-much-power-does-it-n...) Adafruit PiTFT - 2.8" Raspberry Pi Touchscreen with full-on backlight the current draw is ~100mA. (http://www.adafruit.com/product/1601 http://www.adafruit.com/product/1601) 0.15=0.5W Powerconsumption of Rpi and TFT should be 1.02W at idle. PowerBoost 500 Charger - Rechargeable 5V Lipo USB Boost @ 500mA+ (http://www.adafruit.com/product/1944 http://www.adafruit.com/product/1944) 2.500Ah 3.7V LiPo 3.7V2.5Ah=9.25Wh Boosted to 5V at 95% efficiency 8.79Wh 8.79Wh/1.02W = 8.6h *Edit: I did a mistake when I calculated the Watt-hour. The Watt-hours of the battery can't increase just because the voltage increases, changed it.

jsherer 12y ago
You should let it run idle and see how long until the battery is depleted. I underestimated the losses due to efficiency with my Libretto project (boost converters run at different efficiencies depending on the power draw). I was able to get about 4 hours on a 6600mAh battery pack powering a Pi and a 7" touchscreen with wifi and bluetooth enabled (the project draws about 8W when the screen is turned on, about 5W with it turned off).