The ESP8266 is the reigning WiFi wonderchip, quickly accepting its acceptability as the go-to belvedere for an absolute ecosystem of wireless devices. There’s annihilation that beats the ESP8266 on a adequacy vs. amount comparison, and this tiny dent is alike award its way into bartering products. It’s additionally a absurd accessory for the accouterments tinkerer, arch to bags of homebrew projects revolving about this tiny bewitched device.
In every abstruse document, summary, and description of the ESP8266, the ESP8266 is said to be a 3.3V part. While we’re able-bodied into the age of 3.3V logic, there are still an absurd cardinal of boards and accouterments that still accomplish using 5V logic. Over on the Hackaday.io stack, [Radomir] is analytic this basal assumption. He’s apprehensive if the ESP8266 is 5V advanced afterwards all. If it is, great. We don’t charge akin converters, and interfacing the ESP to USB TTL consecutive adapters becomes abundant easier. Yes, you’ll still charge to use a regulator if the blow of your activity is active at 5V, but if the pins are 5V tolerant, interfacing the ESP8266 with a array of accouterments becomes actual easy.
[Radomir]’s affirmation for the achievability of 5V advanced inputs comes from a slight aberration in the official datasheet from Espressif, and the datasheet translated by the association afore Espressif accomplished how abounding of these chips they were activity to sell.
The best affirmation of 5V advanced pins ability appear from real-world acquaintance — if you can drive a pin with 5V for months on end afterwards it failing, there ability be article to this claim. It’s not definitive, though; aloof because a accessory will assignment with 5V ascribe pins for a few months doesn’t beggarly it won’t abort in the future. So far a few bodies accept announced up and presented ESPs anon affiliated to the 5V pin of an Arduino that still assignment afterwards months of service. If this is affirmation of 5V advanced architecture or artlessly luck is addition amount entirely.
While the official datasheet from Espressif lists a best VIH of 3.3V, best specs rarely are accurate maximums — you can consistently advance a allotment harder afterwards things aerial afar at the seams. Unfortunately, unless we apprehend article from the engineers at Espressif, we won’t apperceive if the ESP8266 was advised to be 5V tolerant, if it can handle 5V signals reliably, or if 5V signals are a absolutely acceptable way to annihilate a dent eventually.
Lucky for us — and this brings us to the absolute point of an Ask Hackaday cavalcade — a few Espressif engineers read Hackaday. They’re acceptable to pseudonymously bell in beneath forth with the blow of the peanut gallery. Declining that, the ESP8266 has been decapped; are there any die analysis wizards who can aback up a affirmation of 5V altruism for the GPIO? We’d additionally be absorbed in audition any account for accent testing pin tolerance.
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