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katspaugh/README.md

Last active August 29, 2023 06:50
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Draw text on Unicorn Hat with Raspberry Pi Pico
Raw
README.md

Drawing text on a Unicorn Hat

The Pimoroni Unicorn Hat comes with a handy MicroPython SDK. To use it, you need to download Pimoroni's fork of MicroPython that includes the Unicorn library, and upload it to Raspberry Pi Pico. Boot it with the button pressed and drag-n-drop the uf2 file to the disk that will appear on your computer. After that you can upload any Python script to that disk and it will run automatically if it's called main.py.

The Unicorn library has a function called picounicorn.set_pixel that lets you set the color of an individual LED. We take advantage of this function to draw characters using a 5x7 font. Each character is represented by 5 bytes, one per vertical row of pixels (or LEDS).

See https://github.com/Ameba8195/Arduino/blob/master/hardware_v2/cores/arduino/font5x7.h for details.

Temperature sensor

The Raspberry Pi Pico has a built-in temperature sensor. It's not super accurate and it varies from board to board. The thermometer code is taken from this tutorial.

Result

Raw
main.py
import picounicorn
import time
import machine
pixels = [
0x00, 0x00, 0x00, 0x00, 0x00, # 0x00 (nul)
0x3E, 0x5B, 0x4F, 0x5B, 0x3E, # 0x01 (soh)
0x3E, 0x6B, 0x4F, 0x6B, 0x3E, # 0x02 (stx)
0x1C, 0x3E, 0x7C, 0x3E, 0x1C, # 0x03 (etx)
0x18, 0x3C, 0x7E, 0x3C, 0x18, # 0x04 (eot)
0x1C, 0x57, 0x7D, 0x57, 0x1C, # 0x05 (enq)
0x1C, 0x5E, 0x7F, 0x5E, 0x1C, # 0x06 (ack)
0x00, 0x18, 0x3C, 0x18, 0x00, # 0x07 (bel)
0xFF, 0xE7, 0xC3, 0xE7, 0xFF, # 0x08 (bs)
0x00, 0x18, 0x24, 0x18, 0x00, # 0x09 (tab)
0xFF, 0xE7, 0xDB, 0xE7, 0xFF, # 0x0A (lf)
0x30, 0x48, 0x3A, 0x06, 0x0E, # 0x0B (vt)
0x26, 0x29, 0x79, 0x29, 0x26, # 0x0C (np)
0x40, 0x7F, 0x05, 0x05, 0x07, # 0x0D (cr)
0x40, 0x7F, 0x05, 0x25, 0x3F, # 0x0E (so)
0x5A, 0x3C, 0xE7, 0x3C, 0x5A, # 0x0F (si)
0x7F, 0x3E, 0x1C, 0x1C, 0x08, # 0x10 (dle)
0x08, 0x1C, 0x1C, 0x3E, 0x7F, # 0x11 (dc1)
0x14, 0x22, 0x7F, 0x22, 0x14, # 0x12 (dc2)
0x5F, 0x5F, 0x00, 0x5F, 0x5F, # 0x13 (dc3)
0x06, 0x09, 0x7F, 0x01, 0x7F, # 0x14 (dc4)
0x00, 0x66, 0x89, 0x95, 0x6A, # 0x15 (nak)
0x60, 0x60, 0x60, 0x60, 0x60, # 0x16 (syn)
0x94, 0xA2, 0xFF, 0xA2, 0x94, # 0x17 (etb)
0x08, 0x04, 0x7E, 0x04, 0x08, # 0x18 (can)
0x10, 0x20, 0x7E, 0x20, 0x10, # 0x19 (em)
0x08, 0x08, 0x2A, 0x1C, 0x08, # 0x1A (eof)
0x08, 0x1C, 0x2A, 0x08, 0x08, # 0x1B (esc)
0x1E, 0x10, 0x10, 0x10, 0x10, # 0x1C (fs)
0x0C, 0x1E, 0x0C, 0x1E, 0x0C, # 0x1D (gs)
0x30, 0x38, 0x3E, 0x38, 0x30, # 0x1E (rs)
0x06, 0x0E, 0x3E, 0x0E, 0x06, # 0x1F (us)
0x00, 0x00, 0x00, 0x00, 0x00, # 0x20
0x00, 0x00, 0x5F, 0x00, 0x00, # 0x21 !
0x00, 0x07, 0x00, 0x07, 0x00, # 0x22 "
0x14, 0x7F, 0x14, 0x7F, 0x14, # 0x23 #
0x24, 0x2A, 0x7F, 0x2A, 0x12, # 0x24 $
0x23, 0x13, 0x08, 0x64, 0x62, # 0x25 %
0x36, 0x49, 0x56, 0x20, 0x50, # 0x26 &
0x00, 0x08, 0x07, 0x03, 0x00, # 0x27 '
0x00, 0x1C, 0x22, 0x41, 0x00, # 0x28 (
0x00, 0x41, 0x22, 0x1C, 0x00, # 0x29 )
0x2A, 0x1C, 0x7F, 0x1C, 0x2A, # 0x2A *
0x08, 0x08, 0x3E, 0x08, 0x08, # 0x2B +
0x00, 0x80, 0x70, 0x30, 0x00, # 0x2C ,
0x08, 0x08, 0x08, 0x08, 0x08, # 0x2D -
0x00, 0x00, 0x60, 0x60, 0x00, # 0x2E .
0x20, 0x10, 0x08, 0x04, 0x02, # 0x2F /
0x3E, 0x51, 0x49, 0x45, 0x3E, # 0x30 0
0x00, 0x42, 0x7F, 0x40, 0x00, # 0x31 1
0x72, 0x49, 0x49, 0x49, 0x46, # 0x32 2
0x21, 0x41, 0x49, 0x4D, 0x33, # 0x33 3
0x18, 0x14, 0x12, 0x7F, 0x10, # 0x34 4
0x27, 0x45, 0x45, 0x45, 0x39, # 0x35 5
0x3C, 0x4A, 0x49, 0x49, 0x31, # 0x36 6
0x41, 0x21, 0x11, 0x09, 0x07, # 0x37 7
0x36, 0x49, 0x49, 0x49, 0x36, # 0x38 8
0x46, 0x49, 0x49, 0x29, 0x1E, # 0x39 9
0x00, 0x00, 0x14, 0x00, 0x00, # 0x3A :
0x00, 0x40, 0x34, 0x00, 0x00, # 0x3B ;
0x00, 0x08, 0x14, 0x22, 0x41, # 0x3C <
0x14, 0x14, 0x14, 0x14, 0x14, # 0x3D =
0x00, 0x41, 0x22, 0x14, 0x08, # 0x3E >
0x02, 0x01, 0x59, 0x09, 0x06, # 0x3F ?
0x3E, 0x41, 0x5D, 0x59, 0x4E, # 0x40 @
0x7C, 0x12, 0x11, 0x12, 0x7C, # 0x41 A
0x7F, 0x49, 0x49, 0x49, 0x36, # 0x42 B
0x3E, 0x41, 0x41, 0x41, 0x22, # 0x43 C
0x7F, 0x41, 0x41, 0x41, 0x3E, # 0x44 D
0x7F, 0x49, 0x49, 0x49, 0x41, # 0x45 E
0x7F, 0x09, 0x09, 0x09, 0x01, # 0x46 F
0x3E, 0x41, 0x41, 0x51, 0x73, # 0x47 G
0x7F, 0x08, 0x08, 0x08, 0x7F, # 0x48 H
0x00, 0x41, 0x7F, 0x41, 0x00, # 0x49 I
0x20, 0x40, 0x41, 0x3F, 0x01, # 0x4A J
0x7F, 0x08, 0x14, 0x22, 0x41, # 0x4B K
0x7F, 0x40, 0x40, 0x40, 0x40, # 0x4C L
0x7F, 0x02, 0x1C, 0x02, 0x7F, # 0x4D M
0x7F, 0x04, 0x08, 0x10, 0x7F, # 0x4E N
0x3E, 0x41, 0x41, 0x41, 0x3E, # 0x4F O
0x7F, 0x09, 0x09, 0x09, 0x06, # 0x50 P
0x3E, 0x41, 0x51, 0x21, 0x5E, # 0x51 Q
0x7F, 0x09, 0x19, 0x29, 0x46, # 0x52 R
0x26, 0x49, 0x49, 0x49, 0x32, # 0x53 S
0x03, 0x01, 0x7F, 0x01, 0x03, # 0x54 T
0x3F, 0x40, 0x40, 0x40, 0x3F, # 0x55 U
0x1F, 0x20, 0x40, 0x20, 0x1F, # 0x56 V
0x3F, 0x40, 0x38, 0x40, 0x3F, # 0x57 W
0x63, 0x14, 0x08, 0x14, 0x63, # 0x58 X
0x03, 0x04, 0x78, 0x04, 0x03, # 0x59 Y
0x61, 0x59, 0x49, 0x4D, 0x43, # 0x5A Z
0x00, 0x7F, 0x41, 0x41, 0x41, # 0x5B [
0x02, 0x04, 0x08, 0x10, 0x20, # 0x5C backslash
0x00, 0x41, 0x41, 0x41, 0x7F, # 0x5D ]
0x04, 0x02, 0x01, 0x02, 0x04, # 0x5E ^
0x40, 0x40, 0x40, 0x40, 0x40, # 0x5F _
0x00, 0x03, 0x07, 0x08, 0x00, # 0x60 `
0x20, 0x54, 0x54, 0x78, 0x40, # 0x61 a
0x7F, 0x28, 0x44, 0x44, 0x38, # 0x62 b
0x38, 0x44, 0x44, 0x44, 0x28, # 0x63 c
0x38, 0x44, 0x44, 0x28, 0x7F, # 0x64 d
0x38, 0x54, 0x54, 0x54, 0x18, # 0x65 e
0x00, 0x08, 0x7E, 0x09, 0x02, # 0x66 f
0x18, 0xA4, 0xA4, 0x9C, 0x78, # 0x67 g
0x7F, 0x08, 0x04, 0x04, 0x78, # 0x68 h
0x00, 0x44, 0x7D, 0x40, 0x00, # 0x69 i
0x20, 0x40, 0x40, 0x3D, 0x00, # 0x6A j
0x7F, 0x10, 0x28, 0x44, 0x00, # 0x6B k
0x00, 0x41, 0x7F, 0x40, 0x00, # 0x6C l
0x7C, 0x04, 0x78, 0x04, 0x78, # 0x6D m
0x7C, 0x08, 0x04, 0x04, 0x78, # 0x6E n
0x38, 0x44, 0x44, 0x44, 0x38, # 0x6F o
0xFC, 0x18, 0x24, 0x24, 0x18, # 0x70 p
0x18, 0x24, 0x24, 0x18, 0xFC, # 0x71 q
0x7C, 0x08, 0x04, 0x04, 0x08, # 0x72 r
0x48, 0x54, 0x54, 0x54, 0x24, # 0x73 s
0x04, 0x04, 0x3F, 0x44, 0x24, # 0x74 t
0x3C, 0x40, 0x40, 0x20, 0x7C, # 0x75 u
0x1C, 0x20, 0x40, 0x20, 0x1C, # 0x76 v
0x3C, 0x40, 0x30, 0x40, 0x3C, # 0x77 w
0x44, 0x28, 0x10, 0x28, 0x44, # 0x78 x
0x4C, 0x90, 0x90, 0x90, 0x7C, # 0x79 y
0x44, 0x64, 0x54, 0x4C, 0x44, # 0x7A z
0x00, 0x08, 0x36, 0x41, 0x00, # 0x7B {
0x00, 0x00, 0x77, 0x00, 0x00, # 0x7C |
0x00, 0x41, 0x36, 0x08, 0x00, # 0x7D }
0x02, 0x01, 0x02, 0x04, 0x02, # 0x7E ~
0x3C, 0x26, 0x23, 0x26, 0x3C, # 0x7F
0x1E, 0xA1, 0xA1, 0x61, 0x12, # 0x80
0x3A, 0x40, 0x40, 0x20, 0x7A, # 0x81
0x38, 0x54, 0x54, 0x55, 0x59, # 0x82
0x21, 0x55, 0x55, 0x79, 0x41, # 0x83
0x22, 0x54, 0x54, 0x78, 0x42, # 0x84
0x21, 0x55, 0x54, 0x78, 0x40, # 0x85
0x20, 0x54, 0x55, 0x79, 0x40, # 0x86
0x0C, 0x1E, 0x52, 0x72, 0x12, # 0x87
0x39, 0x55, 0x55, 0x55, 0x59, # 0x88
0x39, 0x54, 0x54, 0x54, 0x59, # 0x89
0x39, 0x55, 0x54, 0x54, 0x58, # 0x8A
0x00, 0x00, 0x45, 0x7C, 0x41, # 0x8B
0x00, 0x02, 0x45, 0x7D, 0x42, # 0x8C
0x00, 0x01, 0x45, 0x7C, 0x40, # 0x8D
0x7D, 0x12, 0x11, 0x12, 0x7D, # 0x8E
0xF0, 0x28, 0x25, 0x28, 0xF0, # 0x8F
0x7C, 0x54, 0x55, 0x45, 0x00, # 0x90
0x20, 0x54, 0x54, 0x7C, 0x54, # 0x91
0x7C, 0x0A, 0x09, 0x7F, 0x49, # 0x92
0x32, 0x49, 0x49, 0x49, 0x32, # 0x93
0x3A, 0x44, 0x44, 0x44, 0x3A, # 0x94
0x32, 0x4A, 0x48, 0x48, 0x30, # 0x95
0x3A, 0x41, 0x41, 0x21, 0x7A, # 0x96
0x3A, 0x42, 0x40, 0x20, 0x78, # 0x97
0x00, 0x9D, 0xA0, 0xA0, 0x7D, # 0x98
0x3D, 0x42, 0x42, 0x42, 0x3D, # 0x99
0x3D, 0x40, 0x40, 0x40, 0x3D, # 0x9A
0x3C, 0x24, 0xFF, 0x24, 0x24, # 0x9B
0x48, 0x7E, 0x49, 0x43, 0x66, # 0x9C
0x2B, 0x2F, 0xFC, 0x2F, 0x2B, # 0x9D
0xFF, 0x09, 0x29, 0xF6, 0x20, # 0x9E
0xC0, 0x88, 0x7E, 0x09, 0x03, # 0x9F
0x20, 0x54, 0x54, 0x79, 0x41, # 0xA0
0x00, 0x00, 0x44, 0x7D, 0x41, # 0xA1
0x30, 0x48, 0x48, 0x4A, 0x32, # 0xA2
0x38, 0x40, 0x40, 0x22, 0x7A, # 0xA3
0x00, 0x7A, 0x0A, 0x0A, 0x72, # 0xA4
0x7D, 0x0D, 0x19, 0x31, 0x7D, # 0xA5
0x26, 0x29, 0x29, 0x2F, 0x28, # 0xA6
0x26, 0x29, 0x29, 0x29, 0x26, # 0xA7
0x30, 0x48, 0x4D, 0x40, 0x20, # 0xA8
0x38, 0x08, 0x08, 0x08, 0x08, # 0xA9
0x08, 0x08, 0x08, 0x08, 0x38, # 0xAA
0x2F, 0x10, 0xC8, 0xAC, 0xBA, # 0xAB
0x2F, 0x10, 0x28, 0x34, 0xFA, # 0xAC
0x00, 0x00, 0x7B, 0x00, 0x00, # 0xAD
0x08, 0x14, 0x2A, 0x14, 0x22, # 0xAE
0x22, 0x14, 0x2A, 0x14, 0x08, # 0xAF
0x55, 0x00, 0x55, 0x00, 0x55, # 0xB0
0xAA, 0x55, 0xAA, 0x55, 0xAA, # 0xB1
0xFF, 0x55, 0xFF, 0x55, 0xFF, # 0xB2
0x00, 0x00, 0x00, 0xFF, 0x00, # 0xB3
0x10, 0x10, 0x10, 0xFF, 0x00, # 0xB4
0x14, 0x14, 0x14, 0xFF, 0x00, # 0xB5
0x10, 0x10, 0xFF, 0x00, 0xFF, # 0xB6
0x10, 0x10, 0xF0, 0x10, 0xF0, # 0xB7
0x14, 0x14, 0x14, 0xFC, 0x00, # 0xB8
0x14, 0x14, 0xF7, 0x00, 0xFF, # 0xB9
0x00, 0x00, 0xFF, 0x00, 0xFF, # 0xBA
0x14, 0x14, 0xF4, 0x04, 0xFC, # 0xBB
0x14, 0x14, 0x17, 0x10, 0x1F, # 0xBC
0x10, 0x10, 0x1F, 0x10, 0x1F, # 0xBD
0x14, 0x14, 0x14, 0x1F, 0x00, # 0xBE
0x10, 0x10, 0x10, 0xF0, 0x00, # 0xBF
0x00, 0x00, 0x00, 0x1F, 0x10, # 0xC0
0x10, 0x10, 0x10, 0x1F, 0x10, # 0xC1
0x10, 0x10, 0x10, 0xF0, 0x10, # 0xC2
0x00, 0x00, 0x00, 0xFF, 0x10, # 0xC3
0x10, 0x10, 0x10, 0x10, 0x10, # 0xC4
0x10, 0x10, 0x10, 0xFF, 0x10, # 0xC5
0x00, 0x00, 0x00, 0xFF, 0x14, # 0xC6
0x00, 0x00, 0xFF, 0x00, 0xFF, # 0xC7
0x00, 0x00, 0x1F, 0x10, 0x17, # 0xC8
0x00, 0x00, 0xFC, 0x04, 0xF4, # 0xC9
0x14, 0x14, 0x17, 0x10, 0x17, # 0xCA
0x14, 0x14, 0xF4, 0x04, 0xF4, # 0xCB
0x00, 0x00, 0xFF, 0x00, 0xF7, # 0xCC
0x14, 0x14, 0x14, 0x14, 0x14, # 0xCD
0x14, 0x14, 0xF7, 0x00, 0xF7, # 0xCE
0x14, 0x14, 0x14, 0x17, 0x14, # 0xCF
0x10, 0x10, 0x1F, 0x10, 0x1F, # 0xD0
0x14, 0x14, 0x14, 0xF4, 0x14, # 0xD1
0x10, 0x10, 0xF0, 0x10, 0xF0, # 0xD2
0x00, 0x00, 0x1F, 0x10, 0x1F, # 0xD3
0x00, 0x00, 0x00, 0x1F, 0x14, # 0xD4
0x00, 0x00, 0x00, 0xFC, 0x14, # 0xD5
0x00, 0x00, 0xF0, 0x10, 0xF0, # 0xD6
0x10, 0x10, 0xFF, 0x10, 0xFF, # 0xD7
0x14, 0x14, 0x14, 0xFF, 0x14, # 0xD8
0x10, 0x10, 0x10, 0x1F, 0x00, # 0xD9
0x00, 0x00, 0x00, 0xF0, 0x10, # 0xDA
0xFF, 0xFF, 0xFF, 0xFF, 0xFF, # 0xDB
0xF0, 0xF0, 0xF0, 0xF0, 0xF0, # 0xDC
0xFF, 0xFF, 0xFF, 0x00, 0x00, # 0xDD
0x00, 0x00, 0x00, 0xFF, 0xFF, # 0xDE
0x0F, 0x0F, 0x0F, 0x0F, 0x0F, # 0xDF
0x38, 0x44, 0x44, 0x38, 0x44, # 0xE0
0xFC, 0x4A, 0x4A, 0x4A, 0x34, # 0xE1
0x7E, 0x02, 0x02, 0x06, 0x06, # 0xE2
0x02, 0x7E, 0x02, 0x7E, 0x02, # 0xE3
0x63, 0x55, 0x49, 0x41, 0x63, # 0xE4
0x38, 0x44, 0x44, 0x3C, 0x04, # 0xE5
0x40, 0x7E, 0x20, 0x1E, 0x20, # 0xE6
0x06, 0x02, 0x7E, 0x02, 0x02, # 0xE7
0x99, 0xA5, 0xE7, 0xA5, 0x99, # 0xE8
0x1C, 0x2A, 0x49, 0x2A, 0x1C, # 0xE9
0x4C, 0x72, 0x01, 0x72, 0x4C, # 0xEA
0x30, 0x4A, 0x4D, 0x4D, 0x30, # 0xEB
0x30, 0x48, 0x78, 0x48, 0x30, # 0xEC
0xBC, 0x62, 0x5A, 0x46, 0x3D, # 0xED
0x3E, 0x49, 0x49, 0x49, 0x00, # 0xEE
0x7E, 0x01, 0x01, 0x01, 0x7E, # 0xEF
0x2A, 0x2A, 0x2A, 0x2A, 0x2A, # 0xF0
0x44, 0x44, 0x5F, 0x44, 0x44, # 0xF1
0x40, 0x51, 0x4A, 0x44, 0x40, # 0xF2
0x40, 0x44, 0x4A, 0x51, 0x40, # 0xF3
0x00, 0x00, 0xFF, 0x01, 0x03, # 0xF4
0xE0, 0x80, 0xFF, 0x00, 0x00, # 0xF5
0x08, 0x08, 0x6B, 0x6B, 0x08, # 0xF6
0x36, 0x12, 0x36, 0x24, 0x36, # 0xF7
0x06, 0x0F, 0x09, 0x0F, 0x06, # 0xF8
0x00, 0x00, 0x18, 0x18, 0x00, # 0xF9
0x00, 0x00, 0x10, 0x10, 0x00, # 0xFA
0x30, 0x40, 0xFF, 0x01, 0x01, # 0xFB
0x00, 0x1F, 0x01, 0x01, 0x1E, # 0xFC
0x00, 0x19, 0x1D, 0x17, 0x12, # 0xFD
0x00, 0x3C, 0x3C, 0x3C, 0x3C, # 0xFE
0x00, 0x00, 0x00, 0x00, 0x00 # 0xFF
]
picounicorn.init()
w = picounicorn.get_width()
h = picounicorn.get_height()
def display_text(text):
for x in range(w):
for y in range(h):
picounicorn.set_pixel(x, y, 0, 0, 0)
for i, char in enumerate(text):
print(i, char)
line = ord(char) * 5
for x in range(5):
row = pixels[line + x]
bins = f"{row:#010b}"[3:]
print(bins)
for y in range(7):
picounicorn.set_pixel(x + (i * 5), y, 0, int(bins[6 - y] or 0) * 255, 0)
sensor_temp = machine.ADC(4)
conversion_factor = 3.3 / (65535)
while True:
reading = sensor_temp.read_u16() * conversion_factor
temperature = 27 - (reading - 0.706) / 0.001721
display_text(f"+{temperature}")
time.sleep(1)
@0-Nick
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0-Nick commented Nov 13, 2022

Nice one. I had to addd temprature = int( .. ) on line 289 to make it work as I was getting an x or y out of range error.

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