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openbitcoinatm
Open Bitcoin ATM -- The worlds first completely open-source Bitcoin ATM for Education and Experimentation.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Not sure what the best route there would be, but you can get a pi or arduino to interface with the bill acceptor inputs. It's usually just simple voltage pulses at a given frequency. Some people were making one-way bitcoin ATMs like that wayy back in 2014.
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