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Welcome to pgpdata.net | Another programing blog site Welcome to pgpdata.net Search Primary Menu Skip to content HomeWell-nighSearch for: Effective January 6, 2017 klaus Effective Modern C++, Nov – Dec 2016 Effective C++, Dec 2016 – Jan 2017 Effective STL, Jan 2017 – –More Effective & C++–, –Jan 16 2017– Raspberry Pi Camera December 9, 2016 klaus Installed camera and took first picuture with it. root@pgpdata:/home/pi# raspistill -v -o test.jpg raspistill Camera App v1.3.8 Width 2592, Height 1944, quality 85, filename test.jpg Time wait 5000, Raw no Thumbnail enabled Yes, width 64, height 48, quality 35 Link to latest frame enabled no Full resolution preview No Capture method : Single capture Preview Yes, Full screen Yes Preview window 0,0,1024,768 Opacity 255 Sharpness 0, Contrast 0, Brightness 50 Saturation 0, ISO 0, Video Stabilisation No, Exposure bounty 0 Exposure Mode ‘auto’, AWB Mode ‘auto’, Image Effect ‘none’ Metering Mode ‘average’, Colour Effect Enabled No with U = 128, V = 128 Rotation 0, hflip No, vflip No ROI x 0.000000, y 0.000000, w 1.000000 h 1.000000 Camera component washed-up Encoder component washed-up Starting component connection stage Connecting camera preview port to video render. Connecting camera stills port to encoder input port Opening output file test.jpg Enabling encoder output port Starting capture -1 Finished capture -1 Closing lanugo Close lanugo completed, all components disconnected, disabled and destroyed Raspberry Pi waiting, waiting December 8, 2016 klaus Being wait for the signal generator, to play with the transistor amplifier spin that didn’t work out with my test. And, wait… Shipment from china is slow. Should I just relax for the holiday season? Transistor Dual Feedback Bias November 24, 2016 klaus Thinking well-nigh current meter, I need to overdraw the Shunt Resistor output (0-15mv@0.00375ohm for 0-4A). I can use transistor 8050, lets say hFE is 100-200, the output range would be (0-1.5v/0-3v) and the precision is 13mA/7mA, calculated from 5v/1024 samples. And I can use 2 Shunt Resistors to double the precision. To get linear result, I need a biasing circuit. The one fits is Dual Feedback Bias, R1 sits on top of Shunt to feed mV voltage transpiration to Vb by boosting the wiring voltage. Will test to see if 8050(tested hFE 290) or other transistor works better. ss8050-117753, or 2N4401 (tested hFE 280). BiasingNumberingwill be needed. And without calculation, Divider Bias should be good Will test the rough numbering result, and the breadboard can be used, good good good. Vc = 0.5 – 4v Rc = 1k Ic = 0.5 – 4mA Ib = 2 – 16uA I2 = 10Ib = 0.02mA R1 + R2 = 5v/0.02mA = 250k Vb = 0.7v – R2 = 0.7 / 5 * 250k = 35k R1 = 215k Re = 100ohm Tested and figured out it is not practical to overdraw 15mv DC, that is what opamp for. Electronic Posts navigation 1 2 … 15 Next → This site is well-nigh my programming venture and my hobby projects. I am professional C++ developer, experienced with Linux. Home Automation Living Room: 21.4°C Humidity: 60% Bedroom: 21.4°C Humidity: 60% Attic: 15.4°C Humidity: 70% Door&Alarm status:fire:noPictures of the dayTags Apache Arduino Bluetooth LE Canon Electronic Health intel slim stick Investment OpenVpn Python Raspberry Pi RESTful SensorTag Surveillance WordPress October 2018 M T W T F S S « Jan 1234567 891011121314 15161718192021 22232425262728 293031 Another programing blog site Archives January 2017 December 2016 November 2016 October 2016 Meta Log in Entries RSS Comments RSS WordPress.org Recent Posts Effective Raspberry Pi Camera waiting, waiting Transistor Dual Feedback Bias 3rd round Copyright © 2016. Contact me: admin@pgpdata.net Proudly powered by WordPress