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This commit is contained in:
Craig Richardson 2018-05-14 17:07:40 +01:00
parent 4bc3226be1
commit 46f0b6f7ed
1 changed files with 23 additions and 21 deletions
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44
Trinket_Ultrasonic_Rangefinder/Trinket_Ultrasonic_Rangefinder.py
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@ -1,19 +1,21 @@
# This Code uses the:
# * Adafruit LCD backpack using MCP23008 I2C expander
# * Maxbotic LV-EZ1 Ultrasonic Sensor
#
# Tested with the Trinket M0
# The ultrasonic sensor and pin use should be Gemma M0 compatible
# This sketch reads the LV-EZ1 by pulse count
# Then prints the distance to the LCD and python console
#
# The circuit:
# * 5V to Trinket M0 USB or BAT pin, I2C Backpack 5V and EZ1 +5
# * GND to Trinket M0 GND pin, I2C Backpack GND and EZ1 GND
# * Display I2C Backpack SLK to Trinket GPIO #2
# * Display I2C backpack SDA to Trinket GPIO #0
# * LV-EZ1 Ultrasonic Sensor PW pin to Trinket GPIO #1
# * Backlight can be hard wired by connecting LCD pin 16, 17 or 18 to GND
"""
This Code uses the:
* Adafruit LCD backpack using MCP23008 I2C expander
* Maxbotic LV-EZ1 Ultrasonic Sensor
Tested with the Trinket M0
The ultrasonic sensor and pin use should be Gemma M0 compatible
This sketch reads the LV-EZ1 by pulse count
Then prints the distance to the LCD and python console
The circuit:
* 5V to Trinket M0 USB or BAT pin, I2C Backpack 5V and EZ1 +5
* GND to Trinket M0 GND pin, I2C Backpack GND and EZ1 GND
* Display I2C Backpack SLK to Trinket GPIO #2
* Display I2C backpack SDA to Trinket GPIO #0
* LV-EZ1 Ultrasonic Sensor PW pin to Trinket GPIO #1
* Backlight can be hard wired by connecting LCD pin 16, 17 or 18 to GND
"""
import time
@ -33,7 +35,7 @@ lcd = adafruit_character_lcd.Character_LCD_I2C(i2c, cols, rows)
# calculated mode or median distance
mode_result = 0
# pulseio can store multiple pulses
# pulseio can store multiple pulses
# read in time for pin to transition
samples = 18
pulses = pulseio.PulseIn(board.D1, maxlen=samples)
@ -45,24 +47,24 @@ rangevalue = [0, 0, 0, 0, 0, 0, 0, 0, 0]
time.sleep(.25)
def tof_cm(tof):
def tof_cm(time_of_flight):
"""
EZ1 ultrasonic sensor is measuring "time of flight"
Converts time of flight into distance in centimeters
"""
convert_to_cm = 58
cm = tof / convert_to_cm
cm = time_of_flight / convert_to_cm
return cm
def tof_inches(tof):
def tof_inches(time_of_flight):
"""
EZ1 ultrasonic sensor is measuring "time of flight"
Converts time of flight into distance in inches
"""
convert_to_inches = 147
inches = tof / convert_to_inches
inches = time_of_flight / convert_to_inches
return inches