User Tools

Site Tools


esp32
ModelCore Co-Proc RamWifiBluetoothPeripherals
ESP32 Extensa 32bit LX6 240MHz (2) FSM 520k wifi4 bt4.2
ESP32-S2 Extensa 32bit LX7 240MHz (1) FSM & RISC-V 320k wifi4 x USB Serial, 8-bit DAC(2)
ESP32-S3 Extensa 32bit LX7 240MHz (2) FSM & RISC-V 512k wifi4 ble5 USB Serial
ESP32-C2 RISC-V 32bit 120MHz (1) 272k wifi4 ble5
ESP32-C3 RISC-V 32bit 160MHz (1) 384k wifi4 ble5
ESP32-C6 RISC-V 32bit 160MHz (1) 384k wifi6(2.4ghz) ble5.2
ESP32-H2 RISC-V 32bit 96MHz (1) 256k x ble5 + zigbee

solderstation.jpg

### Blinky (ESP32-S module; ESP32 + 4m flash)

esp32.jpg

  • ESP-Strapping
    • GPIO
      • GPIO12 float low - low 3.3v, high 1.8v (VDD_SDIO)
  • GPIO15 float high U0TXD - high logging, low silent
  • GPIO 0 float high, GPIO 2 float low - Flash boot
  • GPIO 0 gnd low, GPIO 2 float low - Serial boot
  • ESP32-S pins
  • pin25 - programming
  • 1,38,15 - GNDs
  • 2 - pwr, 3 - enable
  • ADC1 (ADC2 unavailable w/ wifi)
  • Sep 2019
  • Oct 2019
    • Move ADC port to an ADC1 Pin pin4-9
    • Another ADC Pin to 3.3v input?
    • Another ADC Pin to vdivider + 15v input
    • Add 3.3v to top of ADC
    • drop 3.3io and 3.3 power ports
    • add oled/serial port at edge
    • short rx/tx lines pin34&pin35
  • Nov-B 2019 (send to pcbs.io)
    • LMS8117AMP-3.3/NOPB
    • LCD pin23 DO, pin16 CLK. (any GPIO)
    • POWER idle 115mA with esphome
    • POWER 16 neopix 17ma(low) 177ma (full red or green or blue) 305ma full white
    • POWER neopix 20ma per color per led
  • Nov-C 2019
    • Reset line (no room)
    • connected 3v bus
    • vreg cap
    • volt Divider ADC (no room)
    • add pullup resistor to one port (for i2c temp sensor)
    • U0 TX 500ohm R close to esp32 (reflections)
  • Dec-D 2019
    • move pin20 (SD1 CLK) to 12 G27 DONE
    • add 4-pin switch port (switch+status led)
    • LVDS connector
    • GPIO12 1.8 vs 3.3v pin14
    • flip micro USB DONE

## wall switch

  • switch
  • switch backlight
  • photosensor
  • distance sensor
  • status led
  • lcd display

## photoresistor

  • super-bright (from cell phone) 300KOhm
  • super-dark (fabric lightly covered) 10MOhm

## signal harmonics https://electronics.stackexchange.com/questions/33372/spi-bus-termination-considerations

esp32.txt · Last modified: 2022/06/01 08:37 by donpdonp