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_P067_HX711.py
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_P067_HX711.py
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#!/usr/bin/env python3
#############################################################################
###################### HX711 plugin for RPIEasy #############################
#############################################################################
#
# Copyright (C) 2023 by Alexander Nagy - https://bitekmindenhol.blog.hu/
#
import plugin
import webserver
import rpieGlobals
import rpieTime
import misc
from lib.hx711.hx711 import HX711
import time
class Plugin(plugin.PluginProto):
PLUGIN_ID = 67
PLUGIN_NAME = "Weight - HX711 Load Cell [EXPERIMENTAL]"
PLUGIN_VALUENAME1 = "WeightChanA"
PLUGIN_VALUENAME2 = "WeightChanB"
def __init__(self,taskindex): # general init
plugin.PluginProto.__init__(self,taskindex)
self.dtype = rpieGlobals.DEVICE_TYPE_DUAL
self.vtype = rpieGlobals.SENSOR_TYPE_DUAL
self.valuecount = 2
self.senddataoption = True
self.recdataoption = False
self.timeroption = True
self.timeroptional = False
self.formulaoption = True
self.readinprogress = 0
self._hx = None
self.initialized = False
self.offset = [ [1,1], [1,1], [1,1], [1,1] ]
def plugin_init(self,enableplugin=None):
plugin.PluginProto.plugin_init(self,enableplugin)
if self.enabled and self.taskdevicepin[0]>0 and self.taskdevicepin[1]>0:
self.readinprogress = 1
try:
self._hx = HX711( int(self.taskdevicepin[1]), int(self.taskdevicepin[0]) ) #dout, sck
self._hx.set_reading_format("MSB","MSB")
self._hx.reset()
self.initialized = True
except Exception as e:
misc.addLog(rpieGlobals.LOG_LEVEL_ERROR,"HX711 init error: "+str(e))
self.initialized = False
self._hx = None
if self._hx is not None:
try:
if self.taskdevicepluginconfig[0] != 0:
self._hx.set_offset_A(self.taskdevicepluginconfig[1])
ref = 0
try:
ref = self.offset[0][0] / self.offset[0][1]
except:
ref = 0
if ref != 0:
self._hx.set_reference_unit_A(ref)
if self.taskdevicepluginconfig[2] != 0:
self._hx.set_offset_B(self.taskdevicepluginconfig[3])
ref = 0
try:
ref = self.offset[1][0] / self.offset[1][1]
except:
ref = 0
if ref != 0:
self._hx.set_reference_unit_B(ref)
except:
pass
self.readinprogress = 0
def plugin_exit(self):
try:
if self._hx:
self._hx.power_down()
except:
pass
def __del__(self):
self.plugin_exit()
def webform_load(self):
webserver.addFormNote("1st GPIO is <b>SCK</b> pin which has to be an output, and 2nd GPIO is the <b>DT</b> pin which has to be an input!<br>Make sure to set it up at <a href='pinout'>Pinout settings</a> first!")
choice1 = self.taskdevicepluginconfig[0]
options = ["Off","Gain 64","Gain 128"]
optionvalues = [0,64,128]
webserver.addFormSubHeader("Measurement Channel A")
webserver.addFormSelector("Mode","modeChA",len(optionvalues),options,optionvalues,None,int(choice1))
webserver.addFormTextBox("Offset","offsChA",self.taskdevicepluginconfig[1],20)
webserver.addFormCheckBox("Tare","tareChA",False)
options = ["Off","Gain 32"]
optionvalues = [0,32]
choice1 = self.taskdevicepluginconfig[2]
webserver.addFormSubHeader("Measurement Channel B")
webserver.addFormSelector("Mode","modeChB",len(optionvalues),options,optionvalues,None,int(choice1))
webserver.addFormTextBox("Offset","offsChB",self.taskdevicepluginconfig[3],20)
webserver.addFormCheckBox("Tare","tareChB",False)
webserver.addFormSubHeader("Calibration Channel A")
webserver.addFormNumericBox("Point 1","adc1ChA",self.offset[0][0])
webserver.addHtml("=")
webserver.addFormTextBox("Value 1","out1ChA",self.offset[0][1],20)
webserver.addFormSubHeader("Calibration Channel B")
webserver.addFormNumericBox("Point 1","adc1ChB",self.offset[1][0])
webserver.addHtml("=")
webserver.addFormTextBox("Value 1","out1ChB",self.offset[1][1],20)
return True
def webform_save(self,params):
try:
self.taskdevicepluginconfig[0] = int(webserver.arg("modeChA",params))
self.taskdevicepluginconfig[1] = float(webserver.arg("offsChA",params))
self.taskdevicepluginconfig[2] = int(webserver.arg("modeChB",params))
self.taskdevicepluginconfig[3] = float(webserver.arg("offsChB",params))
except:
pass
try:
self.offset[0][0] = int(webserver.arg("adc1ChA",params))
self.offset[0][1] = int(webserver.arg("out1ChA",params))
self.offset[1][0] = int(webserver.arg("adc1ChB",params))
self.offset[1][1] = int(webserver.arg("out1ChB",params))
except:
pass
if (webserver.arg("tareChA",params)=="on"):
try:
if self._hx:
while self.readinprogress:
time.sleep(0.01)
self.readinprogress = 1
self._hx.tare_A()
self.readinprogress = 0
self.taskdevicepluginconfig[1] = self._hx.get_offset_A()
except:
pass
if (webserver.arg("tareChB",params)=="on"):
try:
if self._hx:
while self.readinprogress:
time.sleep(0.01)
self.readinprogress = 1
self._hx.tare_B()
self.readinprogress = 0
self.taskdevicepluginconfig[3] = self._hx.get_offset_B()
except:
pass
self.plugin_init()
return True
def plugin_read(self): # deal with data processing at specified time interval
result = False
if self.initialized and self.readinprogress==0 and self.enabled:
self.readinprogress = 1
if self._hx:
self._hx.power_up()
if int(self.taskdevicepluginconfig[0]) != 0: #A
self._hx.set_gain(self.taskdevicepluginconfig[0])
value = self._hx.get_weight_A(5)
self.set_value(1,value,True)
else:
self.set_value(1,0,False)
if int(self.taskdevicepluginconfig[2]) != 0: #B
value = self._hx.get_weight_B(5)
self.set_value(2,value,True) #always gain32
else:
self.set_value(2,0,False)
self._hx.power_down()
self.plugin_senddata()
self._lastdataservetime = rpieTime.millis()
result = True
self.readinprogress = 0
return result
def plugin_write(self,cmd): # Handling commands
res = False
cmdarr = cmd.split(",")
cmdarr[0] = cmdarr[0].strip().lower()
if cmdarr[0]== "tarechan": #a / b
res = True
try:
if cmdarr[0][8] == "a":
if self._hx:
while self.readinprogress:
time.sleep(0.01)
self.readinprogress = 1
self._hx.tare_A()
self.readinprogress = 0
self.taskdevicepluginconfig[1] = self._hx.get_offset_A()
elif cmdarr[0][8] == "b":
if self._hx:
while self.readinprogress:
time.sleep(0.01)
self.readinprogress = 1
self._hx.tare_B()
self.readinprogress = 0
self.taskdevicepluginconfig[3] = self._hx.get_offset_A()
except:
pass
return res