H / floating = Normal execution mode – “SPI Boot” Use a permanent black marker to mark pin 1 on the connector so its obvious when plugging onto the PCB header. The TXD and RXD pins cross over (programmer TXD connects with ESP32 RX).ĪnalogLamb ESP32 Programmer – ġ5.9mm Clear heatshrink – RS Components 873-9191Įnsure you cut away the heatshrink over the “EN” button so it isn’t permanently pressed down. Provides 6 pin header including connections for EN and GPIO0 pins meaning you don’t need to provide any programming hardware on your target board. Off the shelf programming adapters AnalogLamb ESP32 Programmer with CH340 USB to Serial ChipĪnalogLamb ESP32 Programmer with CH340 USB to Serial Chip However for production boards you may well not want to add components only required at programming time on the board itself. On many development boards with built-in USB/Serial the programming hardware is provided for you and software such as esptool.py can automatically reset the board into bootloader mode using it.
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