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ESP32 SDR: from failed 433 MHz experiments to live phone decoding

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An ESP32-S3 investigation, updated with live Android decoding and physical tests on 17 October 2026. An ESP32-S3 can expose real radio samples. The question is how far that capability carries toward useful applications. Conceptual illustration. I wanted to turn an ESP32 into something more ambitious than another Wi-Fi gadget: a small radio instrument that could capture a remote-control transmission, send the recording to a phone, decode it and eventually reproduce it. The starting point was the ESPARGOS esp-sdr project , which exposes raw radio samples from hardware already inside supported ESP32 chips. That is an exciting capability. It also raises an easy-to-misunderstand question: if software can ask the chip to tune to a frequency, can the chip actually receive useful information there? We tested that question through firmware changes, controlled radio transmissions, independent receivers and a Flutter phone app. We tried GPS, broadcast FM, 433 MHz remote-control signals, n...
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Display animation on OLED using arduino i2c

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Yeaaaa #diy #hacks #oled #arduino #Ironman #animation #makeraddictz A photo posted by Mohesh Mohan (@moheshmohan) on Oct 19, 2014 at 11:41pm PDT Hey folks, So i got this new cheap oled display that i wanted for a long time and its time for us to play with it. So you can find lot of tutorials on the web on how to drive the display but lets just move a step farther, lets do some animation with it. OLED 0.96" 128X64  from aliexpress what i have is an OLED 0.96" 128X64 I2C (or IIC) interface, with SSD1306 driver, 3.3/5V compatible. There are 4 pin on the OLED module, GND, VCC, SCL and SDA. Typically to use I2C on an arduino uno you need to connect it something like this GND - GND on Arduino Uno VCC - 5V on Arduino Uno SCL - A5 on Arduino Uno SDA - A4 on Arduino Uno Lets have a look at the fritzing view of the connections Now how do we drive this thing? Don't worry there is an awesome library for led/lcd displays its called u8glib and y...
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Now that terminator genisys is out, how about a Terminator T800 Desktop toy - My 3d printing saga

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Hi Folks, If you have read my other posts about my 3d printing saga , you might have guessed that i already built a 3d printer. Sorry to leap forward with this post before completing my build log of the printer but i think this is the right time to post this. Especially now we have the Terminator genisys on theaters. So that the terminator movies rebooted itself with the new movie genisys in theaters now, i wanted to do something for the amazing T-800 :). I am an avid fan of terminator series, i love the animatronics and graphics used by them. Then i found a cool 3d model in thingiverse with holes for led in t-800 here . This is an awesome model as it has slots for 5 mm LED's in the eyes and has passage inside head for wires. Awesome. DONT FORGET TO CHECK OUT THE VIDEO AT BOTTOM So I downloaded the model an printed it using white PLA. The print took almost 6+ hours but it turned out to be amazing. See for yourself T800 Front T800 side As you can see t...
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Location: Kochi, Kerala, India
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Qualys SSL labs API - A MultiThreaded python script to scan large number of servers and produce neat results

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Hi Security enthusiast, So if you were following closely on recent developments regarding SSL/TLS security, you might have heard that Qualys SSL labs released an API to automate the testing of internet hosted applications with their awesome hosted testing solution. If you have not heard about it here is the location to their server testing page -  https://www.ssllabs.com/ssltest/ And their API documentation here -  https://github.com/ssllabs/ssllabs-scan/blob/master/ssllabs-api-docs.md So now that the API is released you can automate testing of any number of servers with any language that is able to talk with qualys server via HTTP protocol. My company wanted to test all of our servers with SSL labs, so i thought why can't i automate it with python or something. So here it is, i made a multithreaded python script to test a large number of servers in one go and get results in neat format that my management wanted :-) The script is intended for python 2.7 Yo...
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Shooting awesome timelapse using raspberry pi

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Hi folks, So if you have a raspberry pi and a camera module one of the cool things that you can do is to make a rig that does time-lapse videos. So i just did that, believe me its awesome. Now you all know from my previous posts that i do have a 3d printer, so i printed a neat little case for my raspberry pi and a sweet little camera mount. And i bought a custom camera module for raspberry pi from uctronics.com , they have a detachable lens and its kinda good quality and cheap too. Thanks uctronics :) By the way, you can get the STL files for the Pi case and uctronics camera modules from the below links. Have fun print them :) Pi case -  http://www.thingiverse.com/thing:423216 Camera module case and mount -  http://www.thingiverse.com/thing:572117 Here are some pics of the printed case and camera mount pi uctronics camera Then i have used a xiaomi 5200 mah power-bank which kinda powers my pi with WiFi dongle, camera and thumb-drive for about a d...
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Beginning of my 3d printing saga - First mistake

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Hi Readers, So it begins here like i have told in the preface page  i finally decided to buy a kit. Having decided that i began searching to find an Indian seller who sells the kit, Indian because i was afraid of any customs tax if i order it from ebay.com or aliexpress.com. After lot of searching i finally found a seller who sells the kit for INR 25k but was it a mistake? You tell me :) Update 25th July 2015 After writing this blog many people pinged me in Facebook and asked me to reveal the name of the seller. So far i thought, what is done is done, why should i go behind them? But then i saw a post on one of the 3D printing group in Facebook where someone is trashing the seller for posting an advertisement. To my surprise the guy pointed out my blog and kept on accusing the seller for bad stuff and fraud. Somehow my name got dragged into all that, then seller addressed a post to me claiming that he did the right thing. I am pretty upset with his mindset and i think its ti...
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SANS 2014 - Abu Dhabi (SEC575 Mobile device security and ethical hacking)

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Hey guys, So here is a glimpse of my training trip to Abu Dhabi for SANS 2014. The course i attended was SEC-575 Mobile device security and ethical hacking. I really had a great time and the session was very informative. Since its not fare to shoot a video of the entire session and upload it on YouTube here in the below video is just glimpse to give you a feel of the class. Enjoy ... here it is Abu Dhabi was really beautiful and i really enjoyed the entire week though i was alone :P SEC575 course is awesome and i really learned quite a few tricks from the session. The instructor was Tim Medin and he was a cool guy. Here is myself and Tim. You can go through a lot of pics that i took on my facebook album here  https://www.facebook.com/mohesh.mohan/media_set?set=a.10152110007848811.1073741839.611573810&type=3
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Running ubuntu linux on mk808 minipc

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Howdy folks So my mission this time is to run Linux on cheap Chinese MK808 Minipc which comes with stock android and can be connected to your HDMI television and make it smart. This device is powered by an ARM 1 GHZ dual core processor, plenty of RAM, good GPU and internal WiFi all compressed into little tiny dongle which is slightly bigger than a normal flash drive. With its dual-core 1.6-GHz Rockchip RK3066 CPU, 1GB of RAM and 8GB of internal storage, the MK808 Android Stick PC provides solid performance that's good enough for playing full-HD movies, surfing the Web and even doing some gaming. Noted Android developer Finless makes a custom ROM for the MK808 and available for download on freaktab.com. This custom ROM allows full 1080p output, a set of additional launchers and the ability to remotely control your Mini PC from an Android phone or tablet. After downloading Finless ROM and connecting the MK808 to a Windows PC while pressing a paper clip into a hole o...
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