In this video I hook up a pair of sensors: TMP36 and MAX31865 to the ESP32. No affiliation with any of the vendors below. The TMP36 https://www.amazon.com/gp/product/B01GH32AQU/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1 https://www.analog.com/media/en/technical-documentation/data-sheets/TMP35_36_37.pdf The MAX31865 and PT100 https://www.amazon.com/gp/product/B071DVVZHC/ref=ppx_yo_dt_b_asin_title_o08_s01?ie=UTF8&psc=1 https://www.amazon.com/gp/product/B072LSRB22/ref=ppx_yo_dt_b_asin_title_o09_s01?ie=UTF8&psc=1 https://datasheets.maximintegrated.com/en/ds/MAX31865.pdf The code and schematic https://github.com/thaaraak/ESP32-Temperature https://github.com/thaaraak/ESP32-Temperature/tree/main/kicad/ESP32-Temperature 0:00 Intro 0:49 The TMP36 2:27 The MAX31865 4:57 The PT100 temperature probe 5:56 Schematic for both connected to ESP32 7:16 Walkthrough of components on breadboard 8:01 Running the code 8:47 Dunking the probe in hot water 9:19 Looking at the SPI interactions on the oscilloscope 10:10 Looking at a temp read SPI call on the oscilloscope 11:40 Some problems encountered with SPI 14:00 Code walkthrough for ESP-IDF SPI (apologies for low volume) 15:23 The temperature calcs for TMP36 and MAX31865 18:20 A question on reusing Arduino libraries in ESP-IDF 19:45 Wrapup ... https://www.youtube.com/watch?v=XcWFJHk5ktI

This is a followup to an earlier video I did https://www.youtube.com/watch?v=Gl6FiF01iAE The above video gives a full background on LoRa - In this video I show how to connect a standard ESP32 to an off the shelf LoRa board. This is the LoRa board I am using https://www.amazon.com/gp/product/B07BD42DYY/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 This as antenna (note the above board does not come with an antenna) https://www.amazon.com/gp/product/B086ZG5WBR/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Code is pretty much the same as the Heltec board although pins are different (and as I note the low power LoRa output pin works on this board) https://github.com/thaaraak/ESP32-Lora ... https://www.youtube.com/watch?v=yIS4DbOkT60

In this new series I will be building and testing a low power SDR SSB Transmitter. The schematics for the transmit mixer (work in progress) are here: https://github.com/thaaraak/ESP32-Tayloe-Mixer The code is here: (just PTT for the moment - more to come) https://github.com/thaaraak/SDR-Transmitter Original video: https://www.youtube.com/watch?v=XySzNe7rXbk Link for determining electret current http://mynixworld.info/2017/09/01/simple-electret-microphone-circuit/ 0:00 Intro 1:21 I/Q based transmitter block diagram 2:54 Schematic walkthrough for Transmit mixer 6:35 Board populated with supply, ESP32 and ES8388 7:58 Phase Shift testing 10:06 Arduino software walkthrough 11:49 Adding a low pass filter in software and retesting 13:41 Walkthrough of microphone and connections 15:33 Microphone preamp circuit 16:44 Microphone preamp board 17:24 Preamp board populated 17:59 Testing the preamp board on the oscilloscope 19:47 Connecting the microphone/preamp to the transmit mixer 21:06 Looking at the 0/90 degree shifted audio from microphone to oscilloscope 22:33 Wrap up and next video description ... https://www.youtube.com/watch?v=XdupkNW19kA

Ellie firing a 45 Sig 1911 for the first time ... https://www.youtube.com/watch?v=l_Q1ML7ZZ78