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<iframe width="450" height="260" style="border: 1px solid #cccccc;" src="https://thingspeak.com/channels/864730/charts/3?bgcolor=%23ffffff&color=%23d62020&dynamic=true&results=60&type=line&update=15"></iframe>
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If not difficult, share the firmware for the connection htu21d and esp-01.
I have not been able to make friends with them for a month.
Thanks.