User talk:Technil
From Openmoko
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Hey there. I probably won't have too much to say until I get the phone in late march sometime.. I have interest in working on: | Hey there. I probably won't have too much to say until I get the phone in late march sometime.. I have interest in working on: | ||
| − | - '''A cycle computer using GPS'''. | + | - '''A cycle computer using GPS'''. Here is some info about power usage of the GPS: |
| + | |||
| + | Excerpted from "GPS time synch" thread on [http://lists.openmoko.org/mailman/listinfo/community Community Digest] | ||
| + | |||
| + | >> Based on ballpark estimates from other similar devices, it's probably | ||
| + | >> around 70mW. | ||
| + | >> | ||
| + | >> This will really hurt if you keep it on all the time, fortunately, for | ||
| + | >> most applications, you probably don't need to. | ||
| + | >> If it works at 2s on, 30s off, as seems likely, this alone drains | ||
| + | >> 1/30th of the battery per day, which isn't bad. Especially as you can | ||
| + | >> probably back off a little if the phone has been stationary for | ||
| + | >> several minutes. | ||
| + | >> | ||
| + | >> Does GPS work well in such a mode? I seem to remember from various | ||
| + | >> handheld units that it can take quite a while (minutes) to sync up to | ||
| + | >> a given satellite. (For all I know, you *can* operate this way, I'm | ||
| + | >> completely clueless on the subject.) | ||
| + | |||
| + | 70mW.. Here is the [http://wiki.openmoko.org/wiki/Neo1973_Battery Neo1973 Battery info] | ||
| + | For the sampling needed to get accurate speeds distance etc.. I don't think using AGPS and sleeping the GPS intermittently will be feasible.. so we need to know how long we can use the GPS continuously and not cripple the phone with power consumption. A dyanmo or supplemantary power source on the bike is another option but would need a regulator and dock of some sort. | ||
| + | |||
| + | The Battery is a Li-Ion 3.7V at 1200mAh or roughly 4.4 Wh. If we only let GPS use 1/4 of the battery power, that gives us 1.1Wh or 0.3 Ah at 3.7V. At 0.070 W (the "guess" on the power draw for the GPS) the current draw indicates that the GPS should work for a little bit less than 16 Hours.. Plenty even for two days of extended touring. | ||
| + | |||
- '''A high quality multi-purpose calculator.''' maybe [http://qalculate.sourceforge.net/ Qalculate]? it is GTK+ 2.4 needs scrollkeeper, libglade 2, as well as a build of libqalculate. Looks like OE has libglade and scrollkeeper, and Open Moko is GTK. So I guess I should get my OE environment all set up and do a test build. [http://www.handhelds.org/hypermail/gpe/24/2411.html this thread] on GPE maybe of importance looks like a problem with libm. This may be of use.. [http://www.openembedded.org/user-manual&dpage=commonuse_prebuilt_toolchain toolchain stuff] text input might be slow, but probably no slower than a graphing calculator. | - '''A high quality multi-purpose calculator.''' maybe [http://qalculate.sourceforge.net/ Qalculate]? it is GTK+ 2.4 needs scrollkeeper, libglade 2, as well as a build of libqalculate. Looks like OE has libglade and scrollkeeper, and Open Moko is GTK. So I guess I should get my OE environment all set up and do a test build. [http://www.handhelds.org/hypermail/gpe/24/2411.html this thread] on GPE maybe of importance looks like a problem with libm. This may be of use.. [http://www.openembedded.org/user-manual&dpage=commonuse_prebuilt_toolchain toolchain stuff] text input might be slow, but probably no slower than a graphing calculator. | ||
- '''Messing around with speex on SIP / IAX clients.''' Lowly GPRS... :P | - '''Messing around with speex on SIP / IAX clients.''' Lowly GPRS... :P | ||
Revision as of 21:58, 20 February 2007
Hey there. I probably won't have too much to say until I get the phone in late march sometime.. I have interest in working on:
- A cycle computer using GPS. Here is some info about power usage of the GPS:
Excerpted from "GPS time synch" thread on Community Digest
>> Based on ballpark estimates from other similar devices, it's probably >> around 70mW. >> >> This will really hurt if you keep it on all the time, fortunately, for >> most applications, you probably don't need to. >> If it works at 2s on, 30s off, as seems likely, this alone drains >> 1/30th of the battery per day, which isn't bad. Especially as you can >> probably back off a little if the phone has been stationary for >> several minutes. >> >> Does GPS work well in such a mode? I seem to remember from various >> handheld units that it can take quite a while (minutes) to sync up to >> a given satellite. (For all I know, you *can* operate this way, I'm >> completely clueless on the subject.)
70mW.. Here is the Neo1973 Battery info For the sampling needed to get accurate speeds distance etc.. I don't think using AGPS and sleeping the GPS intermittently will be feasible.. so we need to know how long we can use the GPS continuously and not cripple the phone with power consumption. A dyanmo or supplemantary power source on the bike is another option but would need a regulator and dock of some sort.
The Battery is a Li-Ion 3.7V at 1200mAh or roughly 4.4 Wh. If we only let GPS use 1/4 of the battery power, that gives us 1.1Wh or 0.3 Ah at 3.7V. At 0.070 W (the "guess" on the power draw for the GPS) the current draw indicates that the GPS should work for a little bit less than 16 Hours.. Plenty even for two days of extended touring.
- A high quality multi-purpose calculator. maybe Qalculate? it is GTK+ 2.4 needs scrollkeeper, libglade 2, as well as a build of libqalculate. Looks like OE has libglade and scrollkeeper, and Open Moko is GTK. So I guess I should get my OE environment all set up and do a test build. this thread on GPE maybe of importance looks like a problem with libm. This may be of use.. toolchain stuff text input might be slow, but probably no slower than a graphing calculator.
- Messing around with speex on SIP / IAX clients. Lowly GPRS... :P
