Uploaded October 2021 | Updated September 2026, 2 weeks ago
Maker Cast is a monthly stream that wanders from maker channel to maker channel, where makers share their latest projects. We always try to have some new people on, that can talk about what they're doing as well.
🎞 Previous episodes: https://www.youtube.com/playlist?list...
🐦 Maker Cast Twitter: twitter.com/TheMakerCast
📧 Newsletter for when MakerCast goes live: tinyletter.com/makercast
find the host on Twitter: @MrBananas
This month's guests are:
★ Brian Lough
YouTube: youtube.com/brianlough
Web: http://blough.ie
Twitter: twitter.com/witnessmenow
Discord: discord.gg/2enC6GW
★ Unexpected Maker
YouTube: youtube.com/unexpectedmaker
Web: unexpectedmaker.com
Twitter: twitter.com/unexpectedmaker
Discord: discord.gg/xAHpApP
★ James Sharman
YouTube: youtube.com/weirdboyjim
Twitter: twitter.com/WeirdBoyJim
Discord: discord.com/invite/jmf6M3z7XS
★ bitluni
YouTube: youtube.com/bitlunislab
Twitter: twitter.com/bitluni
Patreon: patreon.com/bitluni
Hosted by:
★ atomic14
YouTube: youtube.com/atomic14
Twitter: twitter.com/MrBananas
Discord: discord.gg/JEKhw4TaW8
Maker Cast is a monthly stream that wanders from maker channel to maker channel, where makers share their latest projects. We always try to have some new people on, that can talk about what they're doing as well.
🎞 Previous episodes: https://www.youtube.com/playlist?list...
🐦 Maker Cast Twitter: twitter.com/TheMakerCast
📧 Newsletter for when MakerCast goes live: tinyletter.com/makercast
find the host on Twitter: @MrBananas
This month's guests are:
★ Brian Lough
YouTube: youtube.com/brianlough
Web: http://blough.ie
Twitter: twitter.com/witnessmenow
Discord: discord.gg/2enC6GW
★ Unexpected Maker
YouTube: youtube.com/unexpectedmaker
Web: unexpectedmaker.com
Twitter: twitter.com/unexpectedmaker
Discord: discord.gg/xAHpApP
★ James Sharman
YouTube: youtube.com/weirdboyjim
Twitter: twitter.com/WeirdBoyJim
Discord: discord.com/invite/jmf6M3z7XS
★ bitluni
YouTube: youtube.com/bitlunislab
Twitter: twitter.com/bitluni
Patreon: patreon.com/bitluni
Hosted by:
★ atomic14
YouTube: youtube.com/atomic14
Twitter: twitter.com/MrBananas
Discord: discord.gg/JEKhw4TaW8










![Record & Playback Audio on ESP32 SD Card: Step-by-Step Guide & Demo
In this video, we record audio to an SD Card as a WAV file and then play it back.
If you like ESP32 audio videos - Ive got a complete set on this playlist: https://www.youtube.com/playlist?list=PL5vDt5AALlRfGVUv2x7riDMIOX34udtKD
Im using an I2S microphone in the video which Ive set up to use DMA to collect the samples. These are streamed straight to the SD Card and we create the WAV file header so that its a valid file.
For playback, Im using an I2S 3W amplifier board from Adafruit. This is connected to a 4ohm speaker. Once again we use DMA to transfer the samples which are streamed from the SD Card.
You should be able to modify the code to use the built-in ADC and an analogue microphone board, and you can modify the code to output using the DAC which would let you wire this up to headphones or an analogue amplifier.
[0:55] SD Card to SPI Wiring Diagram
[1:11] Soldering up an SD Card adaptor
[1:30] Getting it working
[2:27] Demo
[2:50] Looking at the WAV file on our PC
[3:22] Conclusions and wrap up
As always the code is on GitHub: https://github.com/atomic14/esp32_sdcard_audio
I2S Amplifier MAX98357 - https://amzn.to/3cg88Z5
TinyPico - https://amzn.to/3vVoONp
or ESP32 Dev board: https://amzn.to/3gb6fyc
INMP441 I2S Microphone: https://amzn.to/3cicuiv
or ICS-43434 I2S Microphone: https://www.tindie.com/products/21519/
I think I might turn this into a nice little voice memo device.
Patreon: https://www.patreon.com/atomic14
ko-fi: https://ko-fi.com/atomic14 Record & Playback Audio on ESP32 SD Card: Step-by-Step Guide & Demo](https://i.ytimg.com/vi/bVru6M862HY/mqdefault.jpg)