ESP32 DevKit V1 30 Pin vs 38 Pin: Which Board Should Students Use?

When buying ESP32 boards, students often see 30-pin and 38-pin DevKit versions. Both can work for IoT projects, but the layout difference matters when following diagrams, plugging into breadboards and explaining the wiring in your report.

The Rectronx ESP32 Pinout Tool focuses on the common 30-pin ESP32 DevKit V1 style. If your board has 38 pins, the same ESP32 technical cautions still apply, but the physical header layout may differ.

Main Difference

Item	30-pin ESP32 DevKit	38-pin ESP32 DevKit
Size	Usually narrower	Usually wider
Breadboard use	Often easier	Can cover more breadboard rows
Exposed pins	Fewer pins exposed	More pins exposed
Beginner diagrams	Very common	Also common, but layout varies
FYP advice	Good choice for most projects	Good if you need more exposed pins

For most student IoT projects, the 30-pin board is enough. DHT11, OLED, GPS, relay, MQ sensor and Blynk projects do not need every ESP32 pin.

Why Board Layout Matters

ESP32 diagrams on the internet are not always for the same board. A pin label may exist on the chip, but the physical header position can change between board versions.

Before wiring:

1. Check the label printed on your exact board.
2. Confirm the GPIO number, not only the D-label.
3. Use a pinout tool or board diagram that matches your board style.
4. Test one module at a time.

Technical Cautions Are Still The Same

Whether your board is 30-pin or 38-pin, these ESP32 facts remain important:

• GPIO0, GPIO2, GPIO5, GPIO12 and GPIO15 are strapping pins.
• GPIO34 to GPIO39 are input-only.
• ADC2 can conflict with WiFi.
• GPIO6 to GPIO11 are usually connected to flash and should not be used for normal wiring.

This is why the ESP32 Pinout Tool highlights boot, ADC and input-only warnings instead of only drawing a board.

Which Board Should You Buy?

Choose 30-pin ESP32 DevKit V1 if:

• You are building a normal IoT FYP.
• You want easier breadboard wiring.
• Your project uses common modules like DHT11, OLED, relay, GPS or MQ sensor.
• You want fewer exposed pins to confuse the team.

Choose 38-pin ESP32 DevKit if:

• You need more exposed pins.
• You already have a wiring diagram for that exact board.
• Your supervisor or lab already uses that board.

Final Recommendation

For most Malaysian FYP students, the 30-pin ESP32 DevKit V1 is a practical starting point. It is cheap, common and enough for many IoT prototypes.

The bigger win is not choosing the largest board. The bigger win is choosing stable pins, testing reset behavior and documenting why each pin was selected.

Start with the ESP32 Pinout Tool, then build your wiring table before connecting modules.