Talk:Other Hardware old - Revision history

Michel: Talk:Other Hardware moved to Talk:Other Hardware old

2010-08-16T09:34:21Z

Talk:Other Hardware moved to Talk:Other Hardware old

← Older revision	Revision as of 03:34, 16 August 2010
(No difference)

Paulcox at 01:33, 13 January 2009

2009-01-13T01:33:05Z

← Older revision		Revision as of 19:33, 12 January 2009
Line 37:		Line 37:
	Third picture shows multiple frames (~8ms per frame)		Third picture shows multiple frames (~8ms per frame)

	[[image:PPM1.jpg\|~~200ps~~]] [[image:PPM2.jpg\|~~200ps~~]] [[image:PPM3.jpg\|~~200ps~~]]		[[image:PPM1.jpg\|200px]] [[image:PPM2.jpg\|200px]] [[image:PPM3.jpg\|200px]]

	*Transmitter		*Transmitter

Paulcox at 01:26, 13 January 2009

2009-01-13T01:26:41Z

← Older revision		Revision as of 19:26, 12 January 2009
Line 33:		Line 33:
	** The PPM signal is present on pin 9 (clock input)		** The PPM signal is present on pin 9 (clock input)

	[[image:~~PPM_signal~~.jpg\|200ps]]		First picture shows a frame with aileron full right
			Second picture shows a frame with aileron full left
			Third picture shows multiple frames (~8ms per frame)

			[[image:PPM1.jpg\|200ps]] [[image:PPM2.jpg\|200ps]] [[image:PPM3.jpg\|200ps]]

	*Transmitter		*Transmitter

Paulcox: /* PDC effort to use Futaba R114F 4 Channel 72MHz RX and "skysport" T4YF 4 channel 72MHx TX */

2009-01-13T00:26:20Z

PDC effort to use Futaba R114F 4 Channel 72MHz RX and "skysport" T4YF 4 channel 72MHx TX

← Older revision		Revision as of 18:26, 12 January 2009
Line 30:		Line 30:

	[[image:triangle_waves.jpg\|200px]]		[[image:triangle_waves.jpg\|200px]]

			** The PPM signal is present on pin 9 (clock input)

			[[image:PPM_signal.jpg\|200ps]]

	*Transmitter		*Transmitter
Line 38:		Line 42:
	** Two position switch would give full signal deflection, Three position switch and two resistors (1.7k) gives decent signal deflection.		** Two position switch would give full signal deflection, Three position switch and two resistors (1.7k) gives decent signal deflection.
	** Wired three position switch with resistors and powered everything on to look at receiver serial signal; fifth triangle wave size changes nicely with switch position.		** Wired three position switch with resistors and powered everything on to look at receiver serial signal; fifth triangle wave size changes nicely with switch position.

			*

Paulcox at 00:54, 6 January 2009

2009-01-06T00:54:23Z

← Older revision		Revision as of 18:54, 5 January 2009
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	** Input (Pins 1 and 2 are wired together) probed using oscilloscope and found odd waveform: Five small triangular waves followed by one large triangular wave. The five small waves change size as the transmitter inputs change:		** Input (Pins 1 and 2 are wired together) probed using oscilloscope and found odd waveform: Five small triangular waves followed by one large triangular wave. The five small waves change size as the transmitter inputs change:

	[[image:triangle_waves.jpg]]		[[image:triangle_waves.jpg\|200px]]

	*Transmitter		*Transmitter

Paulcox at 00:08, 6 January 2009

2009-01-06T00:08:41Z

← Older revision		Revision as of 18:08, 5 January 2009
Line 22:		Line 22:
	* Internal temperature sensor for full temperature compensation outside the 0-70degr. range.		* Internal temperature sensor for full temperature compensation outside the 0-70degr. range.
	* 16 times oversampling		* 16 times oversampling

			== PDC effort to use Futaba R114F 4 Channel 72MHz RX and "skysport" T4YF 4 channel 72MHx TX ==

			*Receiver
			** Opened Receiver and located a Fairchild 74VHC164 Serial-In Parallel-Out Shift Register
			** Input (Pins 1 and 2 are wired together) probed using oscilloscope and found odd waveform: Five small triangular waves followed by one large triangular wave. The five small waves change size as the transmitter inputs change:

			[[image:triangle_waves.jpg]]

			*Transmitter
			The transmitter has support for only four channels but the top left of the case shows that a place to add a switch. Since the receiver showed five waves and only the first four moved with the controls, I assumed the transmitter PCB probably allowed for a fifth channel.
			** Opened the Transmitter and the PCB showed three pads that were clearly meant for a fifth channel.
			** To make chan 5 active a jumper had to be populated
			** Channel five had a resistor divider network (2x 4.7k) so it looks like it for a switch
			** Two position switch would give full signal deflection, Three position switch and two resistors (1.7k) gives decent signal deflection.
			** Wired three position switch with resistors and powered everything on to look at receiver serial signal; fifth triangle wave size changes nicely with switch position.

Comm board: /* External pressure sensor board (altitude) */

2007-02-03T15:44:26Z

External pressure sensor board (altitude)

← Older revision		Revision as of 09:44, 3 February 2007
Line 1:		Line 1:
			== Internal pressure sensor ==
			needs access to analog grade psu.
			scp1000-d11, costs 20-21$ and can provide 10cm (3.3") accuracy with 2Hz update or 1mt (3.3 foot) with 7Hz update rate.
			The resolution is better. Interface is I2C.

	== External pressure sensor board (altitude) ==		== External pressure sensor board (altitude) ==
	--[[User:Comm board\|Comm board]] 07:46, 31 January 2007 (CET)		--[[User:Comm board\|Comm board]] 07:46, 31 January 2007 (CET)

Comm board at 06:46, 31 January 2007

2007-01-31T06:46:59Z

← Older revision		Revision as of 00:46, 31 January 2007
Line 1:		Line 1:
			== External pressure sensor board (altitude) ==
			--[[User:Comm board\|Comm board]] 07:46, 31 January 2007 (CET)

	Pressure Sensor:		Pressure Sensor:
	MPXA6115A		MPXA6115A
Line 5:		Line 8:
	Interface, 3.3V I2C interface, 100khz, attiny as alternative processor.		Interface, 3.3V I2C interface, 100khz, attiny as alternative processor.

	MCU pic12f675 or equivalent		* MCU pic12f675 or equivalent
	low cost op-amp (not rail2rail)		* low cost op-amp (not rail2rail)
	1Mhz voltage doubler		* 1Mhz voltage doubler
	Precision 5.0V ldo		* Precision 5.0V ldo
	1x pwm output and at the same time ADC input, 0-3.3V		* 1x pwm output and at the same time ADC input, 0-3.3V
	1x raw pressure sensor input, div 1.4 for 0-3.3V range (max resolution is 981 units), optional		* 1x raw pressure sensor input, div 1.4 for 0-3.3V range (max resolution is 981 units), optional
	1x offset adc input (raw-pwm_out)*gain(1000)		* 1x offset adc input (raw-pwm_out)*gain(1000)
	Internal temperature sensor for full temperature compensation outside the 0-70degr. range.		* Internal temperature sensor for full temperature compensation outside the 0-70degr. range.
	16 times oversampling		* 16 times oversampling

Comm board at 06:36, 31 January 2007

2007-01-31T06:36:56Z

New page

Pressure Sensor:
MPXA6115A
MPXH6115A

Interface, 3.3V I2C interface, 100khz, attiny as alternative processor.

MCU pic12f675 or equivalent
low cost op-amp (not rail2rail)
1Mhz voltage doubler
Precision 5.0V ldo
1x pwm output and at the same time ADC input, 0-3.3V
1x raw pressure sensor input, div 1.4 for 0-3.3V range (max resolution is 981 units), optional
1x offset adc input (raw-pwm_out)*gain(1000)
Internal temperature sensor for full temperature compensation outside the 0-70degr. range.
16 times oversampling