Made a firepit from an old oildrum for an autumn barbeque party. I drilled a lot of holes in the drum to feed the fire with fresh oxygen, and reduce smoke. Worked quite well. Temperature at the bottom of the barrel was around 630°C and made the metal turn orange.
NFC payments are finally getting reality on the #BitcoinTaps drink service. Most likely operational the Bitcoin Amsterdam conference! Checkout bitcointaps.com for updates and events where you can enjoy our beer/wine/water/juice tapping service.
NFC payments for the bliksembier beertap firmware work quite good. What you see is an ESP32 with a PN532 NFC reader. The card is a boltcard (NTAG424). Bitcoin, Lightning, LNbits rock!