Pneumatic module in version 2.0 contain set of sensors for measurement parameters of the air in flight like: pressure, altitude, speed, vertical speed (variometer). Additionally for optimal filling 8 channels of ADC module has 2 inputs for thermocouple and 2 channels for user sensors working in range 0-4V.
Communication with module is done via SPI bus, by reading data from 16-bit A/D converter. Module need 3,3V supply for digital interface and 5,0V for sensors.
From software point of view actual version of firmware measure all parameters, make temperature calibration and individual calibration offset and gain for every sensor.
I mounted first 25 pcs of rotating speed sensors. It has 2 IR LEDs lightening the rotating surface and photoelement connected with operational amplifier working in comparator circuit. The op-amp compare actual light level with moving average. In that way it can adapt itself to wide range of lighting conditions.
Sensor can works with own source of the light, for example lightning black and white sticker on electric outruner engine or with existing ambient light looking on it through propeler. In case of work with own reflected light the distance between sensor and rotating element should be not bigger then 5cm. In factory settings all optical components are set paralelly to each other. The LEDs emit a beam with an angle of aperture 50°. Photo element collects th light from the angle 24°
ADCIO module (means ADC + IO) consist 8 input 16-bit Analog to Digital Converter and 8 digital IO. First 4 digital pins configured as output can drive 4 MOSFET transistors and switch 4A constant current in Open Drain configuration. Next 4 pins can works as universal inputs or outputs in 3.3V CMOS standard.
Inputs of the analog to digital converter are connected to 4 conectors. Every connector have 5V supply, ground and 2 inputs working in range 0-4V.
GPS external module is a source of information about latitude, speed above ground and alternative source of information about altitude and course. Module was made as external to avoid interferences from other electronics. Module can be mounted far from computer outside fuselage. To protect electronics from environmental factors the PCB was resized to fit into popular Z-47U enclosure. Of course module can works without a box.
Module consist 10Hz, 66-chanel GPS receiver with internalantena based on MTK chipset. Depending mounting place: inside or outside fuselage, the LED can be mounted in SMD or THT version. Also backup capacitor can be mounted on the top or bottom side of PCB.
We have another source of Total Energy Compensation (TEK) probes on the market. It can be bought in our Pit.Lab.Shop. Both types of the probe are available:
- probe for horizontal mounting on tail.
- probe for vertical mounting on the fuselage
Probes has length 170 mm and about 11 g weight. Are sold with 2,5 m of silicone hose and plastic connectors. Bigger connector is for easy disconnection the probe after flight, the smaller is for connecting with variometer's pressure sensor nozzle.
The probe allow to compensate changes of kinetic energy made manually by the pilot pulling or pushing elevator stick. Pulling the stick, we made the glider climbing in cost of it's kinetic energy. Not compensated variometer (without a TEK probe) will indicate climbing, because glider in reality will go up, but it is not caused by thermals. Compensated variometer except static pressure will receive from TEK probe also negative dynamic pressure. The negative dynamic pressure is proportional to speed and change of it also will be "visible" by variometer. So correctly compensated variometer should not indicate changes of altitude made by elevator. The probe will work with SkyAssistant and with all other variometers.