I'm running a telegram bot on my Raspberry Pi 3. When I run it in my console or using Thonny, everything runs smoothly.
The problem occurs when I set the program to start on boot.
sudo crontab -e [last line] @reboot sudo python3 /home/pi/Documents/telegrambot.py &
I know that the code is running because I set the bot to send me "I'm online" and it answer me if the reply isn't related to sending images... but when I send to it /tempgraph, it should answer with the the picture of its readings. But I only get the sensor's name and no image at all.
... chatHist = readCommandHistory(db,chat_id,1) lastCommand = chatHist['msg'] choice = command.split(".") if command in lastCommand and len(choice) <= 2: Fonte = re.search('(\s|\n)'+str(command.split('.'))+'\)\s(.*)', lastCommand).group(2) bot.sendMessage(chat_id, Fonte) #this works if len(choice) == 1: table = sdc.readTableServer(db, senstable, 'Fonte', Fonte) for sensor in table.Sensor.unique(): bot.sendMessage(chat_id, sensor) tbl = table[table.Sensor == sensor] #until here everything is ok for ts in tiposensores: try: gop.plotSetup(tbl[['Data',ts]]) #save the image in the folter ... Images/Imagem.png, #but only works when not on stratup... bot.sendPhoto(chat_id,open('/home/pi/Documents/Images/Imagem.png','rb')) pif.cleanImages() except OSError: pass
I found out that the problem happens after i call
inside the plotSetup function, in this step:
f= plt.figure(figsize=(12, 9))
This is the first time that i use the variable f inside the function.
As I said before, the error happens in the plt.figure.
THis is the gpo.plotSetup(), with some changes to catch the error as instructed:
def plotSetup(Data): ...[some code here]... with open("/home/pi/Desktop/log.csv","a+") as o: fop.writeCSVFile(o, ['before first plt.figure']) try: f= plt.figure(figsize=(12, 9)) except IOError as e: fop.writeCSVFile(o, e) except: for e in sys.exc_info(): fop.writeCSVFile(o, e) ...[some code here]... f.savefig("/home/pi/Documents/Images/Imagem.png", bbox_inches="tight")
and i got this errors:
<class '_tkinter.TclError'> no display name and no $DISPLAY environment variable <traceback object at 0x6e3c8d50>
That error led me to this post:
_tkinter.TclError: no display name and no $DISPLAY environment variable
this post suggested use this in the very beginning of the code:
import matplotlib matplotlib.use('Agg')
and then VOILA!! It's alive.
Really appreciate all the help that you guys gave me, thanks! ;p
gop.PlotSetupgenerate a picture and store it on disk?
$ crontab -e