Rantings from a guy with way too much free time

Baby it's Cold Outside -- How Cold? Use an SHT31 and See!

2019-01-29 15 minute read programming Rob Baruch
ESP32 and SHT31 Temperature and Humidity Sensor Secure Web Server In this blog post, I follow-up on the ESP32-IDF development and demonstrate how to incorporate an i2c device to measure the temperature and humidity. Specifically the SHT31. First, let’s do it plain-jane vanilla. We’ll incorporate the i2c device and simply display the measurements to the serial terminal through the uart. Next, we’ll make it more practical and send the data over the wifi network to a service that makes it convenient to visualize the time-series data. Continue reading

Program the Esp32 with ESP-IDF on Mac OS X

2019-01-23 9 minute read programming Rob Baruch
Programming the ESP32 on your Mac! Go out and buy yourself a cheap little ESP32 SoC and follow these basic instructions to setup your development environment on your Mac. If you want to do some advanced C-programming to control your ESP32, this is for you. If you’d rather use Arduino and play with simple sketches then this is not for you – google how to use Arduino and off you go! Continue reading

Using Gqrx with USRP SDR's and DSD voice decoding on Mac OS X without losing your mind

2018-12-19 5 minute read sdr
The Problem: Homebrew formula is a rotten Brew! Over the last few years, using the gqrx package was as simple as using homebrew. However, over late, the keepers of the brew formula hasn’t maintained the build with the most recent gr-osmosdr and Ettus Research UHD Library. So rather than depend on the brew formula, go grab the source and build your own version guaranteed to be up-to-date – and working on your USRP device! Continue reading

Julia Intro

2018-11-07 5 minute read programming
Juliaet, Wherefore art thou? As Yoda once said… > YAPL - yet another programming language. Learn something new, you must. Why Learn Julia? Julia was designed from the beginning for high performance. Julia programs compile to efficient native code for multiple platforms via LLVM. As such, it’s an interesting programming language to take a look at as it’s a serious contender for certain classes of programming problems; most notibly, scientific and data-centric analysis. Continue reading


2018-11-07 8 minute read devops Robert Baruch
Drowning in the Digital Ocean Not all services are created equal - you get what you pay for. I got tired of paying Digital Ocean for a crappy service so I decided to hunt around for a no-frills service that give me a basic instance worthy of hosting a simple blog. Enter ramnode. Ramnode Ramnode is a basic service that quickly affords the addition of new VPS (virtual private servers) at a whopping $3/month per server. Continue reading

Making some Noise - Teensy, TGA-Pro, and MIDI

2018-05-04 12 minute read programming Rob Baruch
Making Some Noise (and maybe even Music)! In this blog post, I’ll share my experiences using the Teensy and TGA-Pro Guitar Audio Shield to process audio - both using an audio processing codec as well as MIDI. I’ve also included the Yamaha UX16 USB-to-MIDI controller to aid in patching my MIDI channels into the inputs of the Guitar Audio shield. Teensy - Yet antother cheap USB uController board. At the hear of this project is the Teensy 3. Continue reading

Pathocaml - Getting Wacky with Functions And Polymorphism

2018-03-19 7 minute read programming Rob Baruch
OCaml on the Fringes - You can do that?? So, I got bored this afternoon and was contemplating why I was enjoying diving into OCaml more than say Elixir/Erlang for functional programming. The quality of the language that’s most captured my attention is the type system. When you start playing around with the type system in OCaml you can go from some basic definitions of user-defined types to some pretty cool looking constructs. Continue reading
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