Raspberry Pi Pico

Raspberry Pi Pico is a low-cost, high-performance microcontroller board with flexible digital interfaces.

Raspberrypi pico design files

raspberry pi pico pinout

pinout and design files

alt text

Run-Reset button (right side)

To help set mass storage with BOOTSEL + RUN-Reset button

Connect with micro-usb

Click on BOOTSEL button to enable mass storage

   1 sudo dmesg
   2 # [ 3570.065996] usb 1-4.3: Product: RP2 Boot
   3 # [ 3570.066006] usb 1-4.3: Manufacturer: Raspberry Pi
   4 # [ 3570.066016] usb 1-4.3: SerialNumber: E0C9xxxxxxxx
   5 # [ 3570.163372] usb-storage 1-4.3:1.0: USB Mass Storage device detected
   6 # [ 3570.164049] scsi host2: usb-storage 1-4.3:1.0
   7 # [ 3570.164381] usbcore: registered new interface driver usb-storage
   8 # [ 3570.180142] usbcore: registered new interface driver uas
   9 # [ 3571.192940] scsi 2:0:0:0: Direct-Access     RPI      RP2              3    PQ: 0 ANSI: 2
  10 # [ 3571.194468] sd 2:0:0:0: Attached scsi generic sg1 type 0
  11 # [ 3571.195164] sd 2:0:0:0: [sdb] 262144 512-byte logical blocks: (134 MB/128 MiB)
  12 # [ 3571.195818] sd 2:0:0:0: [sdb] Write Protect is off
  13 # [ 3571.195830] sd 2:0:0:0: [sdb] Mode Sense: 03 00 00 00
  14 # [ 3571.196325] sd 2:0:0:0: [sdb] No Caching mode page found
  15 # [ 3571.196335] sd 2:0:0:0: [sdb] Assuming drive cache: write through
  16 # [ 3571.217448]  sdb: sdb1
  17 # [ 3571.237585] sd 2:0:0:0: [sdb] Attached SCSI removable disk
  18

Serial USB ttyACM0

   1 sudo dmesg
   2 # [9067045.808125] usb 1-1.3: new full-speed USB device number 7 using dwc_otg
   3 # [9067045.941554] usb 1-1.3: New USB device found, idVendor=2e8a, idProduct=000a, bcdDevice= 1.00
   4 # [9067045.941564] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
   5 # [9067045.941568] usb 1-1.3: Product: Pico
   6 # [9067045.941572] usb 1-1.3: Manufacturer: Raspberry Pi
   7 # [9067045.941577] usb 1-1.3: SerialNumber: E661xxxxxxxxxxxx
   8 # [9067045.944106] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device
   9 apt install picocom 
  10 picocom -b 115200 --echo /dev/ttyACM0 
  11 # on
  12 # Led is ON 5
  13 # Periodical timer at 4238154004018
  14 # on
  15 # Led is ON 5
  16 # off
  17 # Led is OFF 5
  18 # on
  19 # Led is ON 5
  20 # Periodical timer at 4238164004155
  21 # gp21on
  22 # GP21 is ON
  23 # ctrl+a , ctrl+x
  24 # Thanks for using picocom
  25

alt text

ADC2 GP28 PIN34 (hello_adc.c)

https://github.com/raspberrypi/pico-examples/blob/master/adc/hello_adc/hello_adc.c

   1 adc_init()
   2 adc_gpio_init(28)
   3 adc_select_input(2)
   4 uint16_t res = adc_read()
   5 conversion_factor = 3.3f/(1<<12)

ADC4 onboard temperature sensor (onboard_temperature.c)

In the section 4.9. ADC and Temperature Sensor available in rp2040 datasheet it's mentioned that ADC4 reads values from an onboard temperature sensor.

onboard_temperature.c

   1 adc_init()
   2 adc_set_temp_sensor_enabled(true)
   3 adc_select_input(4)
   4 uint16_t res = adc_read()
   5 conversion_factor = 3.3f/(1<<12)

/etc/rc.local in Raspbian to init ttyACM0

   1 #!/bin/sh -e
   2 /usr/bin/logger "Initialize port ttyACMO for raspberry pico"
   3 chmod 666 /dev/ttyACM0
   4 stty -F /dev/ttyACM0 raw speed 115200 -crtscts cs8 -parenb -cstopb
   5 exit 0

NTC Thermistor

1 kΩ NTC Sensor, 500 mW power and material constant 3600K, temperature range between -55°C and 125°C with diameter of 6.5 mm. At 25°C has resistance of 1 kΩ.

The relationship between temperature and resistance for an NTC thermistor is non-linear.

-  ⇤ ← Revision 2 as of 2024-05-04 17:37:22 → 
  Size: 1712
  Editor: vitor
  Comment:
+   ← Revision 33 as of 2026-06-13 16:31:06 → ⇥
  Size: 4980
  Editor: vitor
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 1:
-= Raspberry Pi Pico =
-Line 4:
+Line 3:
- * https://www.raspberrypi.com/documentation/microcontrollers/raspberry-pi-pico.html#technical-specification
+= Raspberry Pi Pico =

 * [[ https://www.raspberrypi.com/documentation/microcontrollers/raspberry-pi-pico.html#technical-specification | technical specification ]]
 * https://datasheets.raspberrypi.com/pico/pico-datasheet.pdf
-Line 6:
+Line 8:
+ * https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf
-Line 9:
+Line 12:
+ * https://github.com/raspberrypi/pico-sdk.git
 * https://github.com/raspberrypi/pico-examples.git
-Line 11:
+Line 16:
+[[ https://datasheets.raspberrypi.com/pico/RPi-Pico-R3-PUBLIC-20200119.zip | Raspberrypi pico design files]]

== raspberry pi pico pinout ==
 * [[ https://www.raspberrypi.com/documentation/microcontrollers/raspberry-pi-pico.html#pinout-and-design-files | pinout and design files ]]

{{attachment:pinoutrpipico-h.png|alt text|width=100% }}

== Run-Reset button (right side) ==
To help set mass storage with BOOTSEL + RUN-Reset button 
{{attachment:reset-run-button.jpg|alt text|width=100% }}
-Line 34:
+Line 50:
+Serial USB ttyACM0
{{{#!highlight sh
sudo dmesg
# [9067045.808125] usb 1-1.3: new full-speed USB device number 7 using dwc_otg
# [9067045.941554] usb 1-1.3: New USB device found, idVendor=2e8a, idProduct=000a, bcdDevice= 1.00
# [9067045.941564] usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
# [9067045.941568] usb 1-1.3: Product: Pico
# [9067045.941572] usb 1-1.3: Manufacturer: Raspberry Pi
# [9067045.941577] usb 1-1.3: SerialNumber: E661xxxxxxxxxxxx
# [9067045.944106] cdc_acm 1-1.3:1.0: ttyACM0: USB ACM device
apt install picocom 
picocom -b 115200 --echo /dev/ttyACM0 
# on
# Led is ON 5
# Periodical timer at 4238154004018
# on
# Led is ON 5
# off
# Led is OFF 5
# on
# Led is ON 5
# Periodical timer at 4238164004155
# gp21on
# GP21 is ON
# ctrl+a , ctrl+x
# Thanks for using picocom
}}}

{{attachment:gp25-gp21-on.jpg|alt text|width=100% }}

== ADC2 GP28 PIN34 (hello_adc.c) ==
 * https://github.com/raspberrypi/pico-examples/blob/master/adc/hello_adc/hello_adc.c
{{{#!highlight c
adc_init()
adc_gpio_init(28)
adc_select_input(2)
uint16_t res = adc_read()
conversion_factor = 3.3f/(1<<12)
}}}

== ADC4 onboard temperature sensor (onboard_temperature.c) ==

In the section '''4.9. ADC and Temperature Sensor''' available in [[https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf | rp2040 datasheet]] it's mentioned that ADC4 reads values from an onboard temperature sensor. 

 * [[ https://github.com/raspberrypi/pico-examples/blob/master/adc/onboard_temperature/onboard_temperature.c | onboard_temperature.c ]]
{{{#!highlight c
adc_init()
adc_set_temp_sensor_enabled(true)
adc_select_input(4)
uint16_t res = adc_read()
conversion_factor = 3.3f/(1<<12)
}}}

== /etc/rc.local in Raspbian to init ttyACM0 ==
{{{#!highlight sh
#!/bin/sh -e
/usr/bin/logger "Initialize port ttyACMO for raspberry pico"
chmod 666 /dev/ttyACM0
stty -F /dev/ttyACM0 raw speed 115200 -crtscts cs8 -parenb -cstopb
exit 0
}}}

== NTC Thermistor ==
 * https://www.tme.eu/en/details/ntcc-1k/tht-measurement-ntc-thermistors/sr-passives/
 * https://mauser.pt/095-0074/ntc-1kr-500mw-6-5mm
 * https://www.tme.eu/Document/7eef32ba0e06f06ac87182b720a77de2/NTCC-1K.pdf

1 kΩ NTC Sensor, 500 mW power and material constant 3600K, temperature range between -55°C and 125°C with diameter of 6.5 mm. At 25°C has resistance of 1 kΩ. 

The relationship between temperature and resistance for an NTC thermistor is non-linear.