[flower carving experience] 14 line blank board pingpong library test external sensor module (one)

1、pinpong Library is a set of software that controls the main control board of open source hardware Python library , be based on Firmata Protocol and compatibility MicroPython grammar ,5 You can use it in minutes Python Control open source hardware . With the help of pinpong library , Direct use Python Code can be used to program various common open source hardware . The principle is to burn a specific firmware for open source hardware , So that the open source hardware can communicate with the computer through the serial port , Carry out various orders .

pinpong The name of the library is given by “Pin” and “Pong” form ,“Pin” Guide foot ,“PinPong” by “ Table Tennis ” Homophony of , Refers to the reciprocation of signals .pinpong The design of the library , It is to let developers not be bound by complex hardware models in the development process , And shift the focus to the implementation of software . Even if it is used in the initial stage of programming Arduino Development , It is changed to the control board during deployment , As long as you modify the parameters of the hardware, you can run normally , Realized “ Write once and run everywhere ”.

2、pinpong Library import method
pinpong The library supports many mainboards and open source hardware , So it is divided into 3 A package ,board、extension and libs,board The package contains functions supported by the motherboard and common libraries ,extension It is a custom class master ,libs An extended library for placing other sensors in .pinpong The library supports the use of multiple master boards , Therefore, you can specify the board type and port number and generate objects , Because the line blank board is fixed as a coprocessor and the port number is fixed , Therefore, you can omit these parameters and initialize directly .

from pinpong.board import xxx   #board Libraries in packages 
from pinpong.libs.xxx    #libs Libraries in packages 
from pinpong.extension.xxx    #extension The motherboard in the package 

Board().begin() # initialization , Connect coprocessor , If the firmware is empty or the version is incorrect, it will be automatically burned 

3、 Experimental hardware

4、9G The steering gear
It's a position ( angle ) Servo driver , It is suitable for those control systems that need to change and maintain the angle . The steering gear is mainly composed of a shell 、 Circuit board 、 Coreless motor 、 Gear and position detector . Its working principle is that the receiver or single chip microcomputer sends a signal to the steering gear , There is a reference circuit inside , The production period is 20ms, Width is 1.5ms The reference signal of , The obtained DC bias voltage is compared with the voltage of the potentiometer , Get voltage difference output . Via... On the circuit board IC Judge the direction of rotation , Then drive the coreless motor to start rotating , The power is transmitted to the swing arm through the reduction gear , At the same time, the signal is sent back by the position detector , Determine whether the location has been reached . It is suitable for those control systems that need to change and maintain the angle . When the motor speed is fixed , The potentiometer is driven to rotate by the cascade reduction gear , Make the voltage difference 0, The motor stops turning . Generally, the rotation angle range of the steering gear is 0 C to 180 degree .

PWM Relationship between signal and steering gear rotation angle
Speaking of the steering gear control signal , Generally, it is pulse width modulation （PWM） The signal , Here's the picture , It's a direct reflection of PWM Relationship between signal and steering gear rotation angle , You can also simply understand it as , Time control by energizing the steering gear , Combined with the feedback signal detection and control of the angle sensor , The precise angle control of the steering gear is realized . The control signal period of the steering gear is 20MS Pulse width modulation signal （PWM）, The pulse width ranges from 0.5ms-2.5ms, The corresponding rudder position is from 0-180 degree , Change linearly . in other words , Provide certain pulse width for the steering gear , His output shaft will maintain a certain corresponding angle , No matter how the external torque changes , Know to give him another pulse signal , The output will change to the new position . There is a reference circuit inside the steering gear , The production period is 20MS, Width is 1.5MS Pulse signal of , There is a comparator , Compare the applied signal with the reference signal , Determine the direction and size , Thus, the rotation signal of the motor is generated . The steering gear is a position servo driver , The rotation range cannot exceed 180 degree , For drives that need to be constantly changing and can be maintained , Metaphorically speaking, robot joints 、 The rudder of an aircraft, etc .

【 Flower carving experience 】14 Empty board pinpong Library test external sensor module （ One of ）
The line blank board tests the external sensor module ——Mind+ Code programming
Test procedure XXI ： Empty board P21 Mouth control steering gear
Experimental wiring ： Empty board P21 Mouth to mouth 9G Steering gear module

#【 Flower carving experience 】14  Empty board pinpong Library test external sensor module （ One of ）
# The line blank board tests the external sensor module ——Mind+ Code programming 
# Test procedure XXI ： Empty board P21 Mouth control steering gear 
# Experimental wiring ： Empty board P21 Mouth to mouth 9G Steering gear module 

from pinpong.extension.unihiker import *
from pinpong.board import Board,Pin
from pinpong.board import Servo
import time

Board().begin()
servo1 = Servo(Pin((Pin.P21)))

while True:
    servo1.write_angle(45)
    time.sleep(2)
    servo1.write_angle(90)
    time.sleep(2)
    servo1.write_angle(180)
    time.sleep(2)
    servo1.write_angle(0)
    time.sleep(2)

Experimental test video （29 second ）

https://v.youku.com/v_show/id_XNTg4MTgyMDg0OA==.html

【 Flower carving experience 】14 Empty board pinpong Library test external sensor module （ One of ）
The line blank board tests the external sensor module ——Mind+ Graphic programming
Test procedure XXII ： Empty board P21 Mouth control steering gear
Experimental wiring ： Empty board P21 Mouth to mouth 9G Steering gear module

Experimental serial port return

Experimental scene

5、DHT11 Temperature and humidity sensor
DHT11 It is a temperature and humidity composite sensor with calibrated digital signal output . It uses special digital module acquisition technology and temperature and humidity sensing technology , Ensure high reliability and excellent long-term stability . The sensor consists of a resistive humidity sensor and a NTC Temperature measuring element , And with a high performance 8 Bit single chip microcomputer connected . So this product has excellent quality 、 Super quick response 、 Strong anti-interference ability 、 High cost performance advantages . Every DHT11 Sensors are calibrated in a very accurate humidity calibration room . The calibration coefficients are stored in the form of a program OTP In the memory , These calibration coefficients are called in the process of signal processing inside the sensor . Single line serial interface , Make system integration easy and fast . Super small size 、 Very low power consumption , The signal transmission distance can reach 20 Meters above , Make it the best choice for all kinds of applications and even the most demanding applications . Products for 4 Single row pin package . Easy to connect , Special packaging forms can be provided according to user needs .

Module description
（1） It can detect the humidity and temperature of the surrounding environment
（2） The sensor uses DHT11
（3） Humidity measurement range ：20%-95%（0 degree -50 Degree range ） Humidity measurement error ：±5%
（4） Temperature measurement range ：0 degree -50 degree Temperature measurement error ：±2 degree
（5） Working voltage 3.3V-5V
（6） Output form Digital output
（7） There are fixing bolt holes , Easy to install
（8） Microplate PCB Size ：3.2cm*1.4cm
（9） Power indicator （ Red ）
（10） Each set weighs about 8g

【 Flower carving experience 】14 Empty board pinpong Library test external sensor module （ One of ）
The line blank board tests the external sensor module ——Mind+ Code programming
Test procedure XXIII ： Empty board P21 Mouth reading DHT11 Temperature and humidity sensor value
Experimental wiring ： Empty board P21 Mouth to mouth DHT11 Temperature and humidity sensor module

#【 Flower carving experience 】14  Empty board pinpong Library test external sensor module （ One of ）
# The line blank board tests the external sensor module ——Mind+ Code programming 
# Test procedure XXIII ： Empty board P21 Mouth reading DHT11 Temperature and humidity sensor value 
# Experimental wiring ： Empty board P21 Mouth to mouth DHT11 Temperature and humidity sensor module 

from pinpong.extension.unihiker import *
from pinpong.board import Board,Pin
from pinpong.board import DHT11
import time

Board().begin()
print(" Empty board P21 Mouth reading DHT11 Temperature and humidity sensor value ")
DHT11 = DHT11(Pin((Pin.P21)))

while True:
    print(" temperature =")
    print(DHT11.temp_c())
    print(" humidity =")
    print(DHT11.humidity())
    time.sleep(1)

Experimental serial port return

【 Flower carving experience 】14 Empty board pinpong Library test external sensor module （ One of ）
The line blank board tests the external sensor module ——Mind+ Graphic programming
Test procedure XXIV ： Empty board P21 Mouth reading DHT11 Value and control LED
Experimental wiring ： Empty board P21 Mouth to mouth DHT11 Temperature and humidity sensor module
Empty board P22 Mouth to mouth LED modular

Experimental serial port return

Experimental scene

（ To be continued ）