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tuanpmt / espduino

ESP8266 network client (mqtt, restful) for Arduino
http://tuanpm.net/post/espduino
MIT License
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Unable to communicate #51

Open lehighkid opened 8 years ago

lehighkid commented 8 years ago

I have followed the installation guide (flashed esp w/ firmware, connected arduino uno and esp as shown, uploaded example MQTT sketch to arduino uno) but I receive garbage in the serial port. I've tried both the FTDI and ardunio port at several different baud rates. I've tried both the release and debug firmwares. I know I can use the esp in stand alone but I would like to add wifi to my ardunio. I also have a nano and tried and received identical results I'm not sure what else to try... Do I need the FTDI controller once it is flashed? Any suggestions? Any help direction would be greatly appreciated.

Namphibian commented 8 years ago

Hi Aaron.

From the top of my head here is some pointers.

Just checking but you are running a logic level converter between Arduino and ESP? If not you might have fried the ESP by now. All connections on ESP is 3,3v only. You might read about some people being lucky with 5V between the two but that advise will bring the blue smoke monster.

If there is a logic level converter between the two see below.

Check the following:

  1. Tx pin ESP serial to Arduino RX Serial pin.
  2. Rx pin ESP serial to Arduino TX pin.
  3. Choose pin on Arduino say pin 4 and connect this to the CH-PD on esp.

Initially I had my Tx to Tx and Rx to Rx. Easy mistake to make when you are wiring even for an old hand.

The CH-PD connection between ESP and Arduino allows Arduino to reset ESP so that Arduino can control it after start up. The line esp.reset() in code pulls signal low then high which resets ESP.

Make sure you dont power ESP from 3.3v output on Arduino as the ESP can use 200mA plus and this can kill Arduino. Best is to use a LM1117 or similar regulator.

I run my custom boards on a 5v power supply with a regulator for 3.3v regulation for ESP.

If you are using two power supplies ie. 5v for arduino and 3.3v for Esp and you are using a logic level converter such as sparkfun converter you have to connect the ground of the 3.3v and 5v circuits. These logic level converters are normally based on BS138 transistors. If logic level conversion is ic based, diode based or resistor divider based then you need to check their application notes for further info.

Kind Regards Neil Franken On 17 Mar 2016 8:44 AM, "Aaron J Drago" notifications@github.com wrote:

I have followed the installation guide (flashed esp w/ firmware, connected arduino uno and esp as shown, uploaded example MQTT sketch to arduino uno) but I receive garbage in the serial port. I've tried both the FTDI and ardunio port at several different baud rates. I've tried both the release and debug firmwares. I know I can use the esp in stand alone but I would like to add wifi to my ardunio. I'm not sure what else to try... Do I need the FTDI controller once it is flashed? Any suggestions? Any help direction would be greatly appreciated.

— You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub https://github.com/tuanpmt/espduino/issues/51

hjfabius commented 8 years ago

Ciao, unfortunately I'm getting exactly the same behavior of @lehighkid.

My full circuit run around 3.3V using an arduino pro mini.

ESP is silent till while(!esp.ready()); and then send approx 10 random chars.. Obviously the code does not proceed further and stay blocked on the while loop.

I tried to also reverse Serial and SoftwareSerial but i've no sucess.

An extra power supplier provide up to 600mA... Any further suggestion?

Ciao hjfabius

lehighkid commented 8 years ago

@Namphibian Thank you for the list of suggestions and insights. I do have a logic level converter but I went back to the Nano, started over and was able to get it working... some what - the serial is still garbled but it does connect to Wifi and publish a message on MQTT. I really appreciate the help - I will definitely save it off for when I attempt to do it again.

notsirius commented 8 years ago

I had similar problems until I added pull-up resistors to both of the gpio pins.

hjfabius commented 8 years ago

Solved also on my side. During the flashing GPIO0 must be low. I forget to remove the low signal during the execution... so it was always in "flashing mode".

Namphibian commented 8 years ago

Hi Aaron.

Just to clarify you are using hardware serial for ESP and Arduino coms?

If so that should be dedicated to only comms between Arduino and ESP. Software serial is a hack at best. For example software serial disables interupt functions during recieves and send, remember it is simulating a serial port. This can cause hardware serial and other functions to behave strangely. So use software serial only while debugging and do it sparingly. If you need more than one hardware serial use the Mega or ATMEL 1284 mcu, look at the callinium(not sure about spelling) project.

One last thing I must mention. I needed to implement a timer function on my project using the ESP. For two weeks I struggled with this. When I included the timer libraries I had some very strange results. Some libraries worked intermittently other libraries did not even compile. I switched the Arduino IDE to verbose output and I realised the IDE used the windows temp directory to store object files.

Since this directory was monitored by my anti virus the anti-virus kicked in and silently removed, blocked or otherwise mangled the code. I switched the anti-virus off and compiled and viola code that would not run or even compile worked like the examples. The Timer2 lib I could not even get am example to compile. After adding arduino ide to safe list I never had this problem again.

So compile your code with anti-virus switched off and check. I have been coding for 35 years and never had anti-virus softly screw my code up. So check it.

Kind Regards Neil Franken On 17 Mar 2016 10:40 AM, "Aaron J Drago" notifications@github.com wrote:

@Namphibian https://github.com/Namphibian Thank you for the list of suggestions and insights. I do have a logic level converter but I went back to the Nano, started over and was able to get it working... some what - the serial is still garbled but it does connect to Wifi and publish a message on MQTT. I really appreciate the help - I will definitely save it off for when I attempt to do it again.

— You are receiving this because you were mentioned. Reply to this email directly or view it on GitHub https://github.com/tuanpmt/espduino/issues/51#issuecomment-197607180