LoPy gets hot

[lebucur]

Sometimes when I leave the board powered for a long time I discover that it gets hot, and I can't connect to it through telnet.
I try to ping the board to 192.168.0.107 but I get a response from 192.168.0.111 that destination cannot be reached. I don't know how that address camed up.
The board is powered at 3.8V on VIN pin.
Does anybody have any idea? Does that have to do with sleep / idle times?

[bucknall]

Hi @lebucur,

Could you double check the code that is running on the device - if you could post your boot.py/main.py we might be able to help you resolve this!

[lebucur]

Hello, here is my boot.py (main.py is empy):

print('>>> boot.py >>>')

ap_ssid = 'lopy'
ap_pass = 'pwd'
known_nets = {
    'net': \
        {'pwd': 'netpwd', 'wconfig': ('192.168.0.105', '255.255.255.0', '192.168.0.1', '0.0.0.0')}
}

import machine
if machine.reset_cause() != machine.SOFT_RESET:
    from network import WLAN
    wl = WLAN() #get wlan handler
    wl.mode(WLAN.STA) #station mode / not AP

    available_nets = wl.scan() #find nearby wireless networks
    nets = frozenset([e.ssid for e in available_nets])
    known_nets_names = frozenset([key for key in known_nets])
    net_to_use = list(nets & known_nets_names)

    try:
        net_to_use = net_to_use[0]
        net_properties = known_nets[net_to_use]
        pwd = net_properties['pwd']
        sec = [e.sec for e in available_nets if e.ssid == net_to_use][0]

        if 'wconfig' in net_properties:
            #wl.ifconfig(config=net_properties['wconfig']) # comment line for statip ip
            pass
        wl.connect(net_to_use, (sec, pwd), timeout=10000)

        import ubinascii # MAC decode
        mac = ubinascii.hexlify(wl.mac(),':').decode()
        print("MAC " + mac)

        while not wl.isconnected(): #wait for connection
            machine.idle() # save power while waiting
            pass

    except Exception as e:
        print("Failed to connect to any known network, going into AP mode")
        wl.init(mode=WLAN.AP, ssid=ap_ssid, auth=ap_pass, channel=6, antenna=WLAN.INT_ANT)

print('<<< boot.py <<<')

[robert-hh]

@lebucur The Lopy warms up a little bit when running. Can you estimate how worm it get's. It's normal that it gets a little bit warmer than environmental temperature, so it feels warm, but you should still be able to touch it without without any pain.
Is it the deviec in total or a specific component?