ESP12F IoT Node with SIM800L Cellular, MT3608/AMS1117 Power, SPI Flash, I2S Audio, USB-C UART, and Li-Ion Management

Pocket Soundbox – LiPo-Powered Cellular I2S MP3 Audio Player (SIMCom A7670E-LASE, Nano-SIM, I2S MP3 to PCM5101A DAC, FM8002E Amp, 1.8V↔3.3V UART/PWRKEY Level Shifting, Remapped J4, MP2315 3.3V Power Path, USB-C ESD/TVS) with power ON/OFF long-press control via SW2 and Q2 featuring pull-ups, RC debounce, and PFET safety clamp (#Cellular #I2S #LiPo #Audio #powerbutton #debounce #PFET)

PaymentSoundBOX – ESP32 MQTT-Enabled Battery Audio Notifier with Isolated Power, I2S Audio Chain & Integrated UI

ESP32 I2S Audio Logger With Advanced USB-C VBUS Protection and Extensive Test Points

ESP32-S3 Audio Logger with Real-time Ambient Capture using I2S MEMS Microphone

Raspberrypi Pico-based sampler, sequencer + drum machine w/ an embedded speaker, Adafruit I2S amplifier and momentary step switches, evoking the tr808 synthesizer ⁠

I2S bus & SD for sound, music & digital audio data #Microcontrollers

Raspberrypi Pico-based sampler, sequencer + drum machine w/ an embedded speaker, Adafruit I2S amplifier and momentary step switches, evoking the tr808 synthesizer ⁠

Raspberrypi Pico-based sampler, sequencer + drum machine w/ an embedded speaker, Adafruit I2S amplifier and momentary step switches, evoking the tr808 synthesizer ⁠

Raspberrypi Pico-based sampler, sequencer + drum machine w/ an embedded speaker, Adafruit I2S amplifier and momentary step switches, evoking the tr808 synthesizer ⁠

Carrier board schematic for network-audio-sink v1.0 using plug-in dev board modules via pin headers plus selected on-board ICs. Initial net plan includes 5V_BUS, 3V3, GND, I2S0/I2S1 audio, SPI control, and Ethernet differential-pair nets.