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  1. P

    [posted] Antenna Analyzer

    Sorry for that. I will enable the page in the next days again. BTW, I stopped my Project because I recognized that there are some hw limitations in the design and better alternatives are available. Peter
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    Teensy 3.5 - Using different voltage references for ADC and DAC

    I made some tests in the evening with a quite simple code, and hopefully solved the issue. In the following source code I have placed the line "analogReference(1);" alternatively before or after the settings for the ADC. In the first case, the ADC outputs "4095" for an analog input, which is...
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    Teensy 3.5 - Using different voltage references for ADC and DAC

    In principle (and simplified), the Teensy drives a signal generator (DDS AD9851) with some of the digital outputs to set its frequency (1-60 MHz). In an analog circuit the signal is processed and the resulting rectified DC signal is routed across an OP back to the ADC input of the Teensy. With...
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    Teensy 3.5 - Using different voltage references for ADC and DAC

    As far as I understood, one set the Uref of the DAC with "analogReference(x)" ,where x is "1" for 1.2V and 0 for 3.3V. But currently I am completely confused about the interworking between the ADC and the DAC. Following the proposal of Pedvide in #5, I changed my code accordingly (and I fully...
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    Teensy 3.5 - Using different voltage references for ADC and DAC

    Thank you - I will try that. I try to understand the code in ADC_Module::setReference(): - When I would like to use the internal 1.2V internal reference, I call "setReference" with the parameter REF_1V2, and then the 1.2V ist switched on as internal reference by an call to VREF::start(). -...
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    Teensy 3.5 - Using different voltage references for ADC and DAC

    Would it be possible to use the ADC library from Pedvide to solve my problem above? It looks like that a call to adc->setReference() only sets the reference voltage for the ADC but does not influence the DAC settings (?). So my idea is to use the standard "analogReference(1)" for the DAC and...
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    Teensy 3.5 - Using different voltage references for ADC and DAC

    In my application I would like to use the - ADC based on a reference voltage of 3.3V - DAC based on a reference voltage of 1.2 V Using the core library (I guess) I only can select the (internal) reference voltage by the call to analogReference(1); // for 1.2V, or analogReference(0); // for...
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    [posted] Antenna Analyzer

    This antenna analyzer can be used to find out, at which frequencies a short-wave antenna is matched to the 50 Ohm impdedance of the cable and the transceiver. This behaviour is presented by the so called "voltage standing wave ratio (VSWR)". To get this value for a frequency range, a Teensy 3.5...
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    Highly optimized ILI9341 (320x240 TFT color display) library

    Thanks - yes, fillRect() was what I meant (not drawRect).
  10. P

    Highly optimized ILI9341 (320x240 TFT color display) library

    Hi, just a short question: is it possible to draw thicker lines on the display. As a workaround I use "tft.drawRect()" instead of "tft.drawLine()", but that might not be the best solution. Thanks. Peter
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