Search found 83 matches

by Tempo
Tue May 26, 2020 3:38 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

Soldering on the SDP3x with a magnifying glass is a challenge. That's what I did with soldering : Soldering works best if you put the silicone tube (without talcum or rinsing out talcum) on both pressure connections and fix the sensor e.g. "relaxed in a miniature vice". I use 0.2mm teflon insulated ...
by Tempo
Tue May 19, 2020 8:38 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

You want to compensate your variometer electronically ? 8-) Then you need openXsensor, an barometric sensor, an air speed sensor and a Prandtl tube with 3 connections ! It is good to branch off the static pressure directly at a Prandtl tube. Don't make the branch after a long hose line, this gives ...
by Tempo
Tue May 19, 2020 8:22 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

Notice: The visible resolutions of the measured values are subject to different conditions. (1) The SDP3x has a resolution that depends on the measuring range. The differential pressure is resolved with 16-bit signed resolution, which means about 15-bit for the positive differential pressures, which...
by Tempo
Fri May 15, 2020 8:04 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

Measurements with SDP32-125Pa in flight . You can measure airspeed in range from 0 km/h up to 52 km/h . ( If you are faster this is no problem, only the value output stops at 52 km/h ;) ) You get an airspeed resolution of 0.05 m/s = 0.18 km/h . SDP32_ASpd_Resolution_measurement.png F3J311_X-2020-05-...
by Tempo
Wed May 06, 2020 9:46 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

Since yesterday I did airspeed measurements with sdp32 + Prandtl probe in air. It works very well. For example my Discus-Launched-Glider is cruising with about 20 km/h. This is airspeed i simulated riding with my bycicle the day before. Next flights I will check Minimum speed with setting flaps and ...
by Tempo
Sun May 03, 2020 6:46 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

My measurement project with a 1.5m-Discus-Launched-Glider is possible with the small dimensions of the openXsensor. It is installed with openXsensor : (1)compensated variometer (barometric sensor MS5611) and TEK-probe (type: "Braunschweiger Düse") (2)airspeed measurement (differential pressure senso...
by Tempo
Sun May 03, 2020 5:58 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

How to built a pitot probe with integrated SDP3x


SDP3x_pitot_parts.jpg
parts for pitot probe

SDP3x_pitot_dimensions.jpg
dimensions and finished pitot probe

Prandtl_Rohr_Abmesssung.jpg
dimensions of prandtl-pitot-probe
by Tempo
Wed Apr 29, 2020 6:56 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

Why thermal-flow-differential-pressure-sensor SDP32-125Pa ? You get the best resolution and accuracy for measurement of low speed while thermal circling. This is the only way that electronic variometer compensation with openXsensor can work well. Ready for the first beta test with the extended open...
by Tempo
Wed Apr 22, 2020 11:19 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

In my current project I am equipping my small DLG glider with sensors: Here I use openXsensor. Until now I use a variometer (sensor: MS5611) with a TEK-probe (type: "Braunschweiger Düse"), a voltage measurement of the 4 single cells of the receiver battery (sensor: 4xADC with voltage divider 1.1Volt...
by Tempo
Wed Apr 22, 2020 10:48 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

Re: New speed sensor: SDP3x

My application example with 3 thermal-flow-sensors and a 5-hole-probe. With this arrangement, flight speed, angle of attack and angle of sideslip are measured simultaneously. The long fuselage head of my F3J thermal glider serves as a probe head, which protrudes far in front of the wing :-) 3 therma...
by Tempo
Wed Apr 22, 2020 10:31 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: New speed sensor: SDP3x
Replies: 13
Views: 1682

New speed sensor: SDP3x

Many thanks to mstrens for the integration of the sensor family SDP3x and SDP8x into the project openXsensor ! ;) SDP3x and SDP8x are thermal-flow-sensors . I have been using thermal-flow sensors for 5 years now for measuring airspeed, but also for angle of attack and sideslip measurements. The meas...
by Tempo
Tue Dec 29, 2015 5:32 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: custom PCB
Replies: 64
Views: 14928

Re: custom PCB

@dschiedsch Addition of coil and capacitor for improved ADC-measurement looks good. Please locate all pads on small side so that soldered cables become unidirectional. Use both sides of double-sided PCB. "I didn't implement 4 pads for NiMh battery because i think it's useless to monitor individual c...
by Tempo
Wed Dec 23, 2015 1:10 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: custom PCB
Replies: 64
Views: 14928

Re: custom PCB

So after a bit of waiting here is the dlg version of my board Have a look at the pdf for details Gerber files are uploaded as well. Board dimensions are 13,5x25mm How's this for a small board? Features vario and 2S lipo measurement Board dimensions smaller as arduinopromini :D Please integrate 3 sm...
by Tempo
Tue Nov 17, 2015 5:20 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: custom PCB
Replies: 64
Views: 14928

Re: custom PCB

Hi I was thinking about integration with the receiver Since the FrSky protocol was reverse engineered http://www.rcgroups.com/forums/showthread.php?t=2124647 I was thinking about integrating both for minimal space. Not sure how well this would work though Do you mean this 8-) : One PCB 30mm x 15 mm...
by Tempo
Mon Nov 16, 2015 5:35 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: custom PCB
Replies: 64
Views: 14928

Re: custom PCB

Hi what would be on the wishlist for a DLG version?... 1. small geometric dimension e.g. 15mm x 30mm like design of "openaltimeter" http://openaltimeter.org/index.html with only holes and flat points for electrical contact 2. arduino-6-pins for flashing firmware 3. high precission MS5611 But shown ...
by Tempo
Thu Nov 12, 2015 3:25 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: custom PCB
Replies: 64
Views: 14928

Re: custom PCB

... I removed unneeded parts of the PCB from Arduino Pro Mini board (serial connections, reset button and LDO). And I reused an LDO from pressure sensor. 1S battery is connected to the MS5611 board (VCC/GND) and power for the Mega is taken from out of the pressure sensor LDO. I do not know what LDO...
by Tempo
Wed Nov 11, 2015 5:36 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: custom PCB
Replies: 64
Views: 14928

Re: custom PCB

Another example http://openrcforums.com/forum/viewtopic.php?f=86&t=4433&hilit=sensor&start=450#p85568 same size as "arduino pro mini" 33mm x 18mm : I have now made ​​even a simple design for a sensor with Alti / Vario and voltage display for 3 or 4 Lipo. Additional voltage regulator stabilizes the i...
by Tempo
Mon Nov 02, 2015 12:35 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: GPS sensor
Replies: 418
Views: 70250

Re: GPS sensor

... Where can I buy the ms4525 you mention? http://openrcforums.com/forum/viewtopic.php?f=48&t=5632#p81716 https://store.3drobotics.com/products/pixhawk-airspeed-sensor-kit http://www.aliexpress.com/store/product/free-shipping-4525DO-DS5AI001DP-MS4525DO-digital-airspeed-meter/621648_32487213012.htm...
by Tempo
Sat Oct 31, 2015 8:34 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Increase voltage resolution with oversampling & decimation
Replies: 17
Views: 3675

Re: Increase voltage resolution with oversampling & decimati

... I will merge it into master when code is fully tested. I had already made the change to increase the resolution. I just added a change to support External reference. I fixed the bug that you just said. The version is on github (in openXsensor_GPS). ... Thank you. This improvement is useful. :) ...
by Tempo
Tue Oct 27, 2015 7:24 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Building TWI(I2C)-sensors for openXsensor with ADS1115
Replies: 16
Views: 5711

Re: Building TWI(I2C)-sensors for openXsensor with ADS1115

If you use device ASC712ELTR-05B-T with Atmega328 on oXS-arduino-board you have current-resolution of 26.4mA/step and current-value and sensitivity depends on VCC, because ACS712 is a ratiometric sensor. For measurements of currents down to mA it´s inadequate, e.g. current consumption of servos in f...
by Tempo
Mon Oct 26, 2015 6:07 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Building TWI(I2C)-sensors for openXsensor with ADS1115
Replies: 16
Views: 5711

Re: Building TWI(I2C)-sensors for openXsensor with ADS1115

Have a look how to modify cheap chinese ACS712-module and add ADS1115, which is a 16-Bit-ADC with Two-Wire-Interface (I2C): oXs_TWIcurrent_Tempo.JPG What´s going on ? First ADS1115 gives 16-bit-value for (VIOUT-VCC/2) on differential input AIN0+ and AIN1-. Using differential value enables to use 16-...
by Tempo
Mon Oct 26, 2015 11:11 am
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Building TWI(I2C)-sensors for openXsensor with ADS1115
Replies: 16
Views: 5711

Re: Building TWI(I2C)-sensors for openXsensor with ADS1115

Indeed , all solutions should work. Just 3 commenst: - I do not know what is the max length of the wiring on I2C bus. I am afraid that if it becomes too long, there could be errors on the bus. Perhaps good to test. Length about 1 to 2 meter are working good. - current sensor is ratiometric. In orde...
by Tempo
Sun Oct 25, 2015 10:29 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: Building TWI(I2C)-sensors for openXsensor with ADS1115
Replies: 16
Views: 5711

Building TWI(I2C)-sensors for openXsensor with ADS1115

You have several options to connect sensors on SmartPort: 1. use one openXsensor with one microcontroller and some sensors 2. use up to 28 openXsensor-microcontrollers with different SENSOR_ID http://openrcforums.com/forum/viewtopic.php?f=86&t=7729 3. use one openXsensor with one microcontroller and...
by Tempo
Thu Oct 22, 2015 2:07 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: SENSOR_ID and using two or more oXs on SPort
Replies: 13
Views: 3171

Re: SENSOR_ID and using two or more oXs on SPort

Thank you ! This is complete answer to "SENSOR_ID and using two or more oXs on SPort" . :D
by Tempo
Thu Oct 22, 2015 1:58 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: SENSOR_ID and using two or more oXs on SPort
Replies: 13
Views: 3171

Re: SENSOR_ID and using two or more oXs on SPort

Thank you Mike for rules how to piece together Bit5, Bit6 and Bit7.
by Tempo
Thu Oct 22, 2015 1:14 pm
Forum: OpenXVario - an open source vario supported by the open source firmwares!!
Topic: SENSOR_ID and using two or more oXs on SPort
Replies: 13
Views: 3171

Re: SENSOR_ID and using two or more oXs on SPort

@mstrens
What about SENSOR_ID substitude with DATA_ID_OXS1 in future oXs-software ?
And it´s perhaps helpful to add rules for valid SENSOR_ID in your very good oXs_config_description.h ?

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