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37 lines
2.1 KiB
37 lines
2.1 KiB
8 years ago
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Esp-Link troubleshooting
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### Troubleshooting
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- verify that you have sufficient power, borderline power can cause the esp module to seemingly
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function until it tries to transmit and the power rail collapses
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- if you just cannot flash your esp8266 module (some people call it the zombie mode) make sure you
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have gpio0 and gpio15 pulled to gnd with a 1K resistor, gpio2 tied to 3.3V with 1K resistor, and
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RX/TX connected without anything in series. If you need to level shift the signal going into the
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esp8266's RX use a 1K resistor. Use 115200 baud in the flasher.
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(For a permanent set-up I would use higher resistor values but
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when nothing seems to work these are the ones I try.)
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- if the flashing succeeded, check the "conn" LED to see which mode esp-link is in (see LED info above)
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- reset or power-cycle the esp-link to force it to become an access-point if it can't
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connect to your network within 15-20 seconds
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- if the LED says that esp-link is on your network but you can't get to it, make sure your
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laptop is on the same network (and no longer on the esp's network)
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- if you do not know the esp-link's IP address on your network, try `esp-link.local`, try to find
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the lease in your DHCP server; if all fails, you may have to turn off your access point (or walk
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far enough away) and reset/power-cycle esp-link, it will then fail to connect and start its
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own AP after 15-20 seconds
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### LED indicators
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Assuming appropriate hardware attached to GPIO pins, the green "conn" LED will show the wifi
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status as follows:
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- Very short flash once a second: not connected to a network and running as AP+STA, i.e.
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trying to connect to the configured network
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- Very short flash once every two seconds: not connected to a network and running as AP-only
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- Even on/off at 1HZ: connected to the configured network but no IP address (waiting on DHCP)
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- Steady on with very short off every 3 seconds: connected to the configured network with an
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IP address (esp-link shuts down its AP after 60 seconds)
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The yellow "ser" LED will blink briefly every time serial data is sent or received by the esp-link.
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