Raspberry Pi Pico MicroPython IoT Device Microcontroller Fix Broken BOOTSEL Issues:
It has dedicated test point pads (TP1–TP6) right in the middle of the board (you can see them in photo, between the two rows of pins, above where GP0/GP1 are labeled). One of those, TP6, is literally the BOOTSEL signal, and one of the others (TP1) is GND — exactly what the button normally shorts together.
Steps:
Unplug the USB cable from the Pico for a moment
Take one of your jumper wires (or just touch the two pads with a single wire/tweezers) and bridge TP6 to a GND pad
Looking at photo, TP6 is the topmost of that middle block of small square pads, and TP1 (or any of the GND-labeled pads nearby, e.g. "GND" next to GP1) works as ground
While holding that short, plug the USB cable into your laptop
Keep holding the bridge for about 2 seconds after plugging in, then release
The Pico should now show up on your computer as a USB drive called RPI-RP2
Tips:
Make sure you're bridging TP6 to GND(TP1), not accidentally two GPIO pads — a wrong short won't hurt anything (these are just logic-level pins) but won't trigger bootloader either
If it doesn't enumerate, try again — timing matters a little (some people find it easier to hold the short first, then plug in USB while still touching)
Once it's in RPI-RP2 mode, drag your .uf2 firmware file onto it like normal
The bootloader shorting worked
What to do now:
Wait a few seconds for it to finish setting up
Open File Explorer (Windows) or Finder (Mac) — you should see a new drive appear named RPI-RP2
If it appears, you're in bootloader mode. Now you just need to flash firmware:
Download a .uf2 file — either:
MicroPython: https://micropython.org/download/RPI_PICO/ (or RPI_PICO2 if this is a Pico 2)
Or whatever firmware/project you were trying to flash originally
Drag and drop the .uf2 file onto the RPI-RP2 drive
The Pico will automatically reboot and run the new firmware once the copy finishes (the drive will disappear — that's normal)
Raspberry Pi Pico - MicroPython - Simulated Candlestick Data Generator:
For Instructions Watch The Video Here:
Upload the Below Code to Arduino Mega through Arduino IDE:
// Arduino Mega - MCUFRIEND TFT Candlestick Chart Display
// -------------------------------------------------------
// Receives simulated candle data from a Raspberry Pi Pico over
// hardware UART (Serial1: TX1=pin18, RX1=pin19) and draws a real,
// scrolling candlestick chart (wicks + coloured bodies), instead of
// just printing text like the original sketch.
//
// Expected line format from the Pico, one per finished candle:
// SYMBOL,OPEN,HIGH,LOW,CLOSE\n
// e.g.
// SIM,100.23,101.10,99.87,100.75\n
#include
#include
MCUFRIEND_kbv tft;
#define LCD_CS A3
#define LCD_CD A2
#define LCD_WR A1
#define LCD_RD A0
#define LCD_RESET A4
#define BLACK 0x0000
#define WHITE 0xFFFF
#define RED 0xF800
#define GREEN 0x07E0
#define GRAY 0x8410
const int CHART_X = 10;
const int CHART_Y = 40;
const int CHART_W = 300; // adjust to fit your TFT's resolution
const int CHART_H = 200;
const int CANDLE_W = 8; // pixel width allotted per candle
const int MAX_CANDLES = CHART_W / CANDLE_W;
struct Candle { float o, h, l, c; };
Candle candles[MAX_CANDLES];
int candleCount = 0;
float chartMin = 0, chartMax = 100;
void setup() {
Serial.begin(9600); // USB - optional, for debugging via laptop
Serial1.begin(9600); // pins 18(TX1)/19(RX1) - talks to the Pico
uint16_t ID = tft.readID();
if (ID == 0xD3D3) ID = 0x9481;
tft.begin(ID);
tft.setRotation(1);
tft.fillScreen(BLACK);
tft.setTextColor(WHITE, BLACK);
tft.setTextSize(2);
tft.setCursor(0, 0);
tft.println("Waiting for candles...");
}
void loop() {
if (Serial1.available()) {
String msg = Serial1.readStringUntil('\n');
msg.trim();
if (msg.length() > 0 && addCandle(msg)) {
drawChart();
Serial.println("OK: " + msg); // debug echo to laptop, if connected
}
}
}
bool addCandle(String msg) {
int p1 = msg.indexOf(',');
int p2 = msg.indexOf(',', p1 + 1);
int p3 = msg.indexOf(',', p2 + 1);
int p4 = msg.indexOf(',', p3 + 1);
if (p1 < 0 || p2 < 0 || p3 < 0 || p4 < 0) return false;
float o = msg.substring(p1 + 1, p2).toFloat();
float h = msg.substring(p2 + 1, p3).toFloat();
float l = msg.substring(p3 + 1, p4).toFloat();
float c = msg.substring(p4 + 1).toFloat();
if (candleCount < MAX_CANDLES) {
candles[candleCount++] = { o, h, l, c };
} else {
// full - scroll left, drop the oldest candle
for (int i = 1; i < MAX_CANDLES; i++) candles[i - 1] = candles[i];
candles[MAX_CANDLES - 1] = { o, h, l, c };
}
// rescale the chart to fit everything currently on screen
chartMin = candles[0].l;
chartMax = candles[0].h;
for (int i = 0; i < candleCount; i++) {
if (candles[i].l < chartMin) chartMin = candles[i].l;
if (candles[i].h > chartMax) chartMax = candles[i].h;
}
float pad = (chartMax - chartMin) * 0.1;
if (pad < 0.01) pad = 1;
chartMin -= pad;
chartMax += pad;
return true;
}
int priceToY(float price) {
float ratio = (price - chartMin) / (chartMax - chartMin);
return CHART_Y + CHART_H - (int)(ratio * CHART_H);
}
void drawChart() {
// header
tft.fillRect(0, 0, tft.width(), CHART_Y - 5, BLACK);
tft.setCursor(0, 0);
tft.setTextColor(WHITE, BLACK);
tft.setTextSize(2);
tft.print("Candles: ");
tft.println(candleCount);
// chart background + border
tft.fillRect(CHART_X, CHART_Y, CHART_W, CHART_H, BLACK);
tft.drawRect(CHART_X, CHART_Y, CHART_W, CHART_H, GRAY);
for (int i = 0; i < candleCount; i++) {
int x = CHART_X + i * CANDLE_W + CANDLE_W / 2;
Candle &cd = candles[i];
bool bullish = cd.c >= cd.o;
uint16_t color = bullish ? GREEN : RED;
int yHigh = priceToY(cd.h);
int yLow = priceToY(cd.l);
int yOpen = priceToY(cd.o);
int yClose = priceToY(cd.c);
// wick
tft.drawLine(x, yHigh, x, yLow, color);
// body
int bodyTop = min(yOpen, yClose);
int bodyBot = max(yOpen, yClose);
if (bodyBot == bodyTop) bodyBot = bodyTop + 1; // keep doji visible
tft.fillRect(x - CANDLE_W / 2 + 1, bodyTop, CANDLE_W - 2, bodyBot - bodyTop, color);
}
}
Run the Below Code from Pico through Thonny IDE:
"""
Raspberry Pi Pico - MicroPython - Simulated Candlestick Data Generator
-----------------------------------------------------------------------
No Wi-Fi, no price feed - this purely SIMULATES a random-walk OHLC
candle every few seconds and streams it over UART to an Arduino Mega
running arduino_mega_candlestick_tft.ino, which draws an actual
scrolling candlestick chart on its TFT shield.
WIRING:
Pico GP0 (UART0 TX) -> Arduino Mega RX1 (pin 19)
Pico GP1 (UART0 RX) -> Arduino Mega TX1 (pin 18) (optional, only
needed for ACKs)
Pico GND -> Arduino Mega GND (required)
NOTE: Arduino Mega logic is 5V, Pico GPIO is 3.3V-only. Put a
voltage divider or logic-level shifter on the Mega TX1 -> Pico
RX (GP1) line if you wire that direction too.
PROTOCOL (one line per finished candle):
SYMBOL,OPEN,HIGH,LOW,CLOSE\n
e.g.
SIM,100.23,101.10,99.87,100.75\n
"""
from machine import UART, Pin
import time
try:
import urandom as random
except ImportError:
import random
def rand_float(a, b):
return a + (b - a) * (random.getrandbits(16) / 65535)
uart = UART(0, baudrate=9600, tx=Pin(0), rx=Pin(1))
SYMBOL = "SIM"
price = 100.0 # starting price
TICKS_PER_CANDLE = 8 # intra-candle random steps (shapes the wick/body)
STEP_RANGE = 0.6 # max +/- move per tick
CANDLE_SECONDS = 3 # how often a new candle is emitted
while True:
open_p = price
high_p = open_p
low_p = open_p
close_p = open_p
for _ in range(TICKS_PER_CANDLE):
close_p += rand_float(-STEP_RANGE, STEP_RANGE)
high_p = max(high_p, close_p)
low_p = min(low_p, close_p)
price = close_p # next candle opens where this one closed
line = "{},{:.2f},{:.2f},{:.2f},{:.2f}\n".format(
SYMBOL, open_p, high_p, low_p, close_p
)
uart.write(line)
print("Sent:", line.strip()) # optional debug, goes out over USB REPL
time.sleep(CANDLE_SECONDS)
Raspberry Pi Pico MicroPython IoT Device Microcontroller:
For Instructions Watch The Video Here:
from machine import Pin
import time
led = Pin(25, Pin.OUT)
while True:
led.on()
time.sleep(1)
led.off()
time.sleep(1)
MicroPython Pico Driving an Arduino Mega TFT Shield:
For Instructions Watch The Video Here:
Upload the Below Code to Arduino Mega through Arduino IDE:
#define LCD_CS A3
#define LCD_CD A2
#define LCD_WR A1
#define LCD_RD A0
#define LCD_RESET A4
#include
#include
MCUFRIEND_kbv tft;
#define BLACK 0x0000
#define BLUE 0x001F
#define RED 0xF800
#define GREEN 0x07E0
#define CYAN 0x07FF
#define MAGENTA 0xF81F
#define YELLOW 0xFFE0
#define WHITE 0xFFFF
void setup(void) {
Serial.begin(9600); // USB - keep for debugging via laptop if connected
Serial1.begin(9600); // <-- pins 18(TX1)/19(RX1), talks to Pico
uint16_t ID = tft.readID();
if (ID == 0xD3D3) ID = 0x9481;
tft.begin(ID);
tft.setRotation(0);
tft.fillScreen(BLACK);
tft.setTextColor(WHITE, BLACK);
tft.setTextSize(2);
tft.setCursor(0, 0);
tft.println("Waiting for Pico...");
}
void loop(void) {
if (Serial1.available()) { // <-- changed from Serial
String msg = Serial1.readStringUntil('\n');
msg.trim();
tft.fillScreen(BLACK);
tft.setCursor(0, 0);
tft.setTextColor(WHITE, BLACK);
tft.setTextSize(2);
tft.println(msg);
Serial.println("OK: " + msg); // this still goes to laptop if USB connected, for debugging
}
}1)
Run the Below Code from Pico through Thonny IDE:
from machine import UART, Pin
uart = UART(0, baudrate=9600, tx=Pin(0), rx=Pin(1))
uart.write('Hello from Pico\n')
