User:ThomasT - Revision history

ThomasT: /* alternative window managers */

2009-01-29T09:01:50Z

‎alternative window managers

2009-01-10T16:40:55Z

‎Heart Rate Monitor via Touchscreen?

2009-01-10T16:36:21Z

‎Heart Rate Monitor

2008-12-17T17:36:23Z

‎Links

2008-12-17T13:29:03Z

‎Poor Audio Frequency Response via Headphones

2008-12-17T13:25:36Z

‎GSM Modem not working

2008-11-18T21:40:04Z

‎Poor Audio Frequency Response via Headphones

2008-11-17T07:10:38Z

‎Real Time Clock unreliable

2008-11-17T06:03:48Z

‎GSM Modem not working

2008-11-14T21:56:53Z

‎Hardware Issues

@@ Line 155: / Line 155: @@
 The bicycle computer should show different values at the same time. This should be user configurable at runtime. What about having little python scripts just showing a window with one value and let the window mananger do the rest?
-It seems ratpoison is the best window manager for openmoko.
+It seems ratpoison is the best window manager for openmoko. I am currently using it with the scripts from
 * http://incise.org/whimsy.html

← Older revision		Revision as of 16:40, 10 January 2009
Line 117:		Line 117:

	The touchscreen also delivers pressure information. Can this be used to measure the heart beat by pressing the thumb onto the touchscreen?		The touchscreen also delivers pressure information. Can this be used to measure the heart beat by pressing the thumb onto the touchscreen?
		+
		+	[[Touchscreen_Filters]]

	== Pedalling Frequency ==		== Pedalling Frequency ==

← Older revision		Revision as of 16:36, 10 January 2009
Line 114:		Line 114:
	Are there Bluetooth Heart Rate Transmitters available?		Are there Bluetooth Heart Rate Transmitters available?

		+	=== Heart Rate Monitor via Touchscreen? ===
		+
		+	The touchscreen also delivers pressure information. Can this be used to measure the heart beat by pressing the thumb onto the touchscreen?

	== Pedalling Frequency ==		== Pedalling Frequency ==

@@ Line 326: / Line 326: @@
 * [[NXP_PCF50633]] Power Managment and RTC
 * [[FAQ]]
 ----

@@ Line 14: / Line 14: @@
 The amplifier output coupling capacitors C4111 and C4110 are much too small (1uF). It should be approx. 100uF according to the datasheet of [[LM4853]].
-I just tried to modify my FreeRunner (inserting 100uF capacitors). But I got a power failure after switching on the audio amplifier. After removing my modifications the system works again, but I couldn't read SD cards any more, because I accidentially removed one of the resistors in the data line to the SD slot.
+I just tried to modify my FreeRunner (inserting 100uF capacitors). But I got a power failure after switching on the audio amplifier. After removing my modifications the system works again, but I couldn't read SD cards any more, because I accidentially removed one of the resistors in the data line to the SD slot. After reinserting the resistor the FreeRunner works again. The sound is much better now, but not really HIFI (maybe this is caused by the cheap HAMA headset I am using).
 BTW: I will replace these series resistors with ferrite beads in the hope to decrease the GPS interferences.

← Older revision		Revision as of 13:25, 17 December 2008
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	Using GPRS is possible, but a bit tricky. I am currently swichting GSM off and on waiting for the modem startup message. But sometimes I get a strange "alarm".		Using GPRS is possible, but a bit tricky. I am currently swichting GSM off and on waiting for the modem startup message. But sometimes I get a strange "alarm".
		+
		+	Maybe [[GSM/Flashing\|reflashing the modem]] would help.

	== Real Time Clock unreliable==		== Real Time Clock unreliable==

@@ Line 27: / Line 27: @@
 == Real Time Clock unreliable==
-The RTC is approx. 12 min off per day. I wonder whether the 10pF capacitors at the oscillator crystal are really needed. Maybe I can tune the RTC by lowering the values of those capacitors.
+The RTC is approx. 12 min off per day. I wonder whether the 10pF capacitors at the oscillator crystal are really needed. Maybe I can tune the RTC by lowering the values of those capacitors. There is no tuning register in the RTC unit.
-Or is there a tuning register in the RTC unit?
-−
 I read a voltage of 475 mV at the terminals of the backup battery BAT1701.
+This voltage increases to 2-3 Volts, when FR is connected to a power supply.
 == GPS: Very long TTFF ==

@@ Line 19: / Line 19: @@
 I could not communicate with the modem not even with u-boot and after removing battery over night.
-In this case with FSO frameworkd slowed down the system very much, OM2008.9 was almost not usable.
+In this case with FSO frameworkd slowed down the system very much, OM2008.9 was almost not usable. (This happend before I made the above HW modifications!)
 I removed frameword (fso-gpsd does not work without frameworkd and therefore needed to be replaced by gpsd.

← Older revision		Revision as of 21:56, 14 November 2008
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	I read a voltage of 475 mV at the terminals of the backup battery BAT1701.		I read a voltage of 475 mV at the terminals of the backup battery BAT1701.
		+
		+
		+	== GPS: Very long TTFF ==
		+
		+	My FreeRunner has this capacitor at the SD card connector. It anyway takes a long time to get the first fix. The antenna connector was slightly deformed. Could not yet test, whether this is the reason for the bad TTFF as SD cards currently do not work any more (due to a hardware bug I introduced while modifing the audio amplifier).

	= Bicycle Computer =		= Bicycle Computer =