Simple adapter allowing to connect ESP-PROG board to breadboard, using provided IDC cables (1.27mm pitch).
ESP-WROOM-32 (or ESP32-SOLO-1) development kit with Micro-USB port, DC Input and ESP-PROG interface, based on Arduino footprint.
This adapter implements common wiring for NE555 astable circuit, exposing pins for external R1, R2 and C1, and of course for VCC, GND and output.