February (issue #427) Circuit Cellar

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4: Wearable LiDAR Spatial Audio Navigator for Visually-Impaired Individuals – Built with a Raspberry Pi Pico, a TF-Luna LiDAR Sensor, and a Hand-Held Potentiometer, By Arnav Shah, Anishka Raina, and Yoon Kang

RESOURCES
Benawake | en.benewake.com
Microchip Technology | microchip.com
Raspberry Pi | raspberrypi.com

REFERENCES
[1] SJ1-3555NG-PI Datasheet – Jacks | Audio Connectors | Same Sky: https://www.sameskydevices.com/product/resource/sj1-355xng.pdf
[2] RP2040 Datasheet: A microcontroller by Raspberry Pi: https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf
[3] MCP4802/4812/4822 Data Sheet: https://vanhunteradams.com/Pico/Cricket/DAC.pdf
[4] TF-Luna LiDAR Datasheet: https://en.benewake.com/uploadfiles/2024/04/20240426135921367.pdf
[5] Interaural Time Difference – An overview | ScienceDirect Topics: https://www.sciencedirect.com/topics/neuroscience/interaural-time-difference
[6] Demonstration video of the Sonic Sight sensory augmentation hat, implemented with a Raspberry Pi Pico: https://youtu.be/l2lWxGuDcH4?si=n5HeED7DPPEKlUQ2
[7 ] Sonic Sight project webpage on GitHub. (This webpage also contains a link to the demonstration video minus commercials): https://ece4760.github.io/Projects/Spring2025/ar933_aks247_dk844/index.html#

SOURCES
Sound localization – Wikipedia: https://en.wikipedia.org/wiki/Sound_localization
Spatial Audio Murder Mystery: https://ece4760.github.io/Projects/Fall2022/mk2592_yw575_asx3/index.html#conclusion
Spatial AudioMap: https://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/f2021/az292_lh479_kw456/az292_lh479_kw456/index.html#Intro

Code and Supporting Files

12: Robot Operating System 2 (ROS 2) – Core Concepts, Architecture, and Real-World Capabilities, By Pedro Bertoleti

RESOURCES
Raspberry Pi | https://www.raspberrypi.com
Ubunto Linus | https://ubuntu.com

REFERENCES
[1] Source: https://automaticaddison.com/ros-2-architecture-overview/
[2] Source: https://docs.ros.org/en/foxy/index.html
[3] Source: https://www.mathworks.com/help/ros/gs/robot-operating-system-ROS 2-basic-concepts.html

Code and Supporting Files

18: Embedded DSP with the RT1010 MCU – Part 2: Delay, Flanger, IIR, and Overdrive, By Raul Alvarez-Torrico

RESOURCES
Ibanez Guitars | ibanez.com

REFERENCES
[1] Raul Alvarez. “Embedded DSP with the RT1010 MCU. Part 1: Workflow and FIR Filters.” Circuit Cellar #425, December, 2025.
[2] Acoustics Part One: Room Acoustics.
https://europe.yamaha.com/en/business/audio/resources/self-training/micro-tutorial/20170928/
[3] What is a flanger? How to use it in music production
https://blog.native-instruments.com/what-is-a-flanger/
[4] Embedded Media Processing, https://www.analog.com/media/en/dsp-documentation/embedded-media-processing/embedded-media-processing-chapter5.pdf
[5] Ibanez Tube Screamer TS-9 project by GM Arts
https://stompboxschematics.com/circuits/ibanez-tube-screamer-ts-9-project-by-gm-arts/
[6] Boost, Overdrive, Distortion & Fuzz: A Beginner’s Guide to Gain Pedals
https://blog.andertons.co.uk/learn/distortion-pedal-beginners-guide
[7] All About Digital Oscillators Part 1 – Aliasing & Foldover
https://www.metafunction.co.uk/post/all-about-digital-oscillators-part-1-aliasing-foldover

SOURCES
MIMXRT1010-EVK
https://www.nxp.com/part/MIMXRT1010-EVK
Sound tests from the author
https://www.youtube.com/playlist?list=PLLNS5tnQ-zCA6h0IKdqOOPKjMG6cAyJTv
Tube Screamer Analysis
https://www.electrosmash.com/tube-screamer-analysis
Blues Solo Guitar no copyright music
https://pixabay.com/music/search/blues%20solo%20guitar/
Slow E-Guitar Blues Solo
https://pixabay.com/music/solo-guitar-slow-e-guitar-blues-solo-10617/
Typical Errors in Digital Audio: Part 6 – Aliasing
https://www.tonmeister.ca/wordpress/2018/03/18/typical-errors-in-digital-audio-part-6-aliasing/
NXP i.MX RT1010 Video guide
https://www.youtube.com/watch?v=W1_jAWtJ3DQ&list=PLsRBa4uXjihbNUr6238NYgdE8GRMZkTM6
Getting Started with i-MX RT1010 Evaluation Kit
https://www.nxp.com/document/guide/getting-started-with-i-mx-rt1010-evaluation-kit:GS-MIMXRT1010-EVK

Code and Supporting Files

28: Data Acquisition with the General Purpose Instrument Bus – Part 2: Visual Display of Multimeter Data with ScottPlot, By Tam Hanna

RESOURCES
HP | keysight.com
Microsoft | microsoft.com
ScottPlot | scottplot.net
Solartron | ametek.com

REFERENCES
[1] Tam Hanna “Data Acquisition with the General Purpose Instrument Bus. Part 1: Design and Installation”.” Circuit Cellar #425, December, 2025.
[2] The ScottPlot Framework: https://scottplot.net/
[3] Solartron 7150 Operating Manual: http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Solartron/Solartron_Schlumberger_7150_Plus_User_Manual.pdf
[4] The ScottPlot 5 Cookbook: https://scottplot.net/cookbook/5/

34: TECHNOLOGY FEATURE: Connected Home Control – Matter: The New Foundation of the Connected Home, By Curtis Franklin

40: DATASHEET: Power on the Bench – Multi-Output Power Supplies, By Curtis Franklin
Aim and Thurlby Thandar Instruments Limited:
https://www.aimtti.com/go/mx/index.php?p=index-mx180tl
B&K Precision Corp.: https://bkpmedia.s3.us-west-1.amazonaws.com/downloads/datasheets/en-us/1760A_Series_datasheet.pdf
Elenco: https://www.elenco.com/wp-content/uploads/2017/10/XP-720K_REV-J-2.pdf
Flir: https://flir.netx.net/file/asset/51641/original/attachment
Global Test Supply: https://www.globaltestsupply.com/pdfs/cache/www.globaltestsupply.com/1370-b/datasheet/1370-b-datasheet.pdf
Good Will Instrument Co., Ltd.:
https://www.gwinstek.com/en-US/products/downloadSeriesDownNew/8182/1237
Keysight Technologies: https://www.keysight.com/us/en/product/U8031A/triple-output-dc-power-supply-30v-6a-2x-5v-3a-375w.html
Siglent Technologies: https://siglent.technology/product/spd3303c-series-programmable-dc-power-supplies/?utm_source=chatgpt.com
Tektronix, Inc.: https://www.tek.com/en/datasheet/2220-2230-2231-series/model-2231a-30-3-195w-triple-channel-dc-power-supply

44: THE SENSOR EDGE: Sensors: From Canned Tuna to Caviar, By Brian Chee

RESOURCES
Analog Devices | www.analog.com
Atlas Scientific | https://atlas-scientific.com
Dragino | https://www.dragino.com
Seeed | www.seeedstudio.com

REFERENCES
[1] https://community.st.com/ysqtg83639/attachments/ysqtg83639/mcu-embedded-software-forum/55896/1/schematic%20DS18B20_TO-92_datasheet_0ec6827c-2bee-4eca-8a6d-5d68ae26bd8f.pdf
[2] https://www.analog.com/en/resources/technical-articles/guide-to-1wire-communication.html
[3] https://www.circuitbasics.com/basics-of-the-i2c-communication-protocol/
[4] https://docs.micropython.org/en/latest/esp8266/tutorial/onewire.html
[5] https://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm
[6] https://wiki.seeedstudio.com/Wio_Node
[7] https://www.wattco.com/2023/08/what-is-a-thermistor/
[8] https://www.allaboutcircuits.com/technical-articles/adc-resolution-vs-adc-accuracy-subrange-adc-two-step-adc-and-total-unadjusted-error/

Image Credits:
Figure 1 – https://community.st.com/ysqtg83639/attachments/ysqtg83639/mcu-embedded-software-forum/55896/1/schematic%20DS18B20_TO-92_datasheet_0ec6827c-2bee-4eca-8a6d-5d68ae26bd8f.pdf
Figure 2 – https://www.researchgate.net/figure/Pt1000-temperature-sensors-R-T-relation-curve-of-the-actually-measured-data_fig2_372145342
Figure 4 – https://www.aggsoft.com/rs232-pinout-cable/serial-cable-connections.htm
Figure 6 – https://atlas-scientific.com/temperature/50mm-temperature-thermowell/
Figure 7 – https://www.allaboutcircuits.com/technical-articles/adc-resolution-vs-adc-accuracy-subrange-adc-two-step-adc-and-total-unadjusted-error/

50: MODERN EMBEDDED INSIGHTS: ADRs: The Missing Memory in Embedded Projects, By Jacob Beningo

REFERENCES
[1] M. Nygard, “Documenting Architecture Decisions,” November 15, 2011, Cognitect, http://thinkrelevance.com/blog/2011/11/15/documenting-architecture-decisions.

SOURCES
Embedded Software Architecture Worksheets and ADR Templates,
https://link.beningo.com/CCarchitecture
Embedded Bytes Newsletter,
https://link.beningo.com/news

54: START TO FINISH: MCU Debugging with JTAG – Using JTAG to Peek Inside Your MCU, By Stuart Ball

Code and Supporting Files

63: TECH THE FUTURE: The Future of Airborne Systems – Airborne Embedded Software Simplifying Safety and Security, By Jay Thomas

RESOURCES
TASKING | www.tasking.com

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February (issue #427) Circuit Cellar