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--- raspberry_pi_pico_hardware [2026/06/14 20:36] – [Key Features] walkeradmin
+++ raspberry_pi_pico_hardware [2026/06/15 21:54] (current) – [Key Features] walkeradmin
@@ Line 7: / Line 7: @@
 ===== Introduction =====
 \\
+Most of this information comes from the following [[https://www.raspberrypi.com/documentation/microcontrollers/pico-series.html|page]]. I have replicated some of it here because sometimes webpages move, are edited or just disappear.
 ==== Pico microcontroller boards ====
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 ----
+===== Raspberry Pi Pico 2 =====
+\\
+Raspberry Pi Pico 2 is based on the RP2350 microcontroller chip. It comes in four variants, listed in Table 2. Unlike Raspberry Pi Pico H and Pico WH, 'headers' isn’t shortened to 'H'.
+\\
+\\
+{{ :pi-pico-table-002.png?600 |}}
+The table above provides a visual reference for the four Raspberry Pi Pico 2 variants as seen from the top. Visually, these variants differ most obviously based on:
+  * The presence or absence of a wireless component.
+  * The presence or absence of presoldered header pins.
+  * The location and type of Serial Wire Debug (SWD) interface.
+=== Pico 2 Hardware ===
+\\
+{{ :pico2-variants.png?600 |}}
+\\
+----
 ==== Wireless Raspberry Pi Pico 2 boards ====
 Raspberry Pi Pico 2 W and Pico 2 W with headers are wireless microcontroller boards based on the RP2350 chip. Both boards offer identical hardware capabilities, with the only physical differences being the presence of presoldered header pins on Raspberry Pi Pico 2 with headers, and the style of the debug connector below the microcontroller.
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   * Wi-Fi (802.11n):
-  *
   * Single-band (2.4 GHz).
-  *
   * WPA3, a modern security protocol for wireless connectivity.
-  *
   * Soft access point for broadcasting a Wi-Fi network, supporting up to four clients.
-  *
   * Bluetooth 5.2:
-  *
   * Support for Bluetooth Low Energy (BLE) Central and Peripheral roles.
-  *
   * Support for Bluetooth Classic.
 \\
+----
 ==== Wireless Details ====
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 \\
 Because this wireless subsystem shares some of the pins, some interface signals are multiplexed with other board functions.
+\\
+  * The SPI clock line (CLK) is shared with the VSYS voltage monitor, and so the ADC can only read VSYS when no SPI transaction is in progress.
+  * The Infineon CYW43439 DIN/OUT and IRQ signals share a pin, so you can only check for interrupt requests (IRQ) when no SPI transaction is in progress.
+For optimal wireless performance, keep the antenna space free. Placing metal near or under the antenna can significantly reduce signal gain and bandwidth; grounded metal placed along the sides of the antenna can improve the antenna’s bandwidth.
+=== Wireless software licensing ===
+The software libraries, libcyw43 and BTstack, are free to use for non-commercial projects. However, Raspberry Pi has negotiated special commercial rights for Raspberry Pi Pico and microcontroller users. This means that users are granted a free licence for commercial use for projects built with:
+  * Wireless Raspberry Pi Pico boards (Raspberry Pi Pico W, Pico WH, Pico 2 W, and Pico 2 W with headers).
+  * A combination of RP2040 and CYW43439, or RP2350 and CYW43439.
+----