The need for clear and reliable communication has driven technology forward for centuries. The longer communication’s reach, the smaller the world becomes. When it comes to cell phones, seamless network coverage and low power draw are the ideals that continually spawn R&D and the eventual deployment of new equipment.
Almost all of us carry a cell phone these days. It takes a lot of infrastructure to support them, whether or not we use them as phones. The most recognizable part of that infrastructure is the communications tower. But what do you know about them?
Continue reading “A Field Guide To The North American Communications Tower”
If you need an industrial-strength IoT product, you need an industrial-strength WiFi chipset. For our own household hacks, we’re totally happy with the ESP8266 chip. But if you need to connect to the big, scary Internet you’ll probably want state-of-the-art encryption. In particular, Amazon insists on TLS 1.2 for their Web Services (AWS), and we don’t know how to get that working on the ESP.
[Anuj] designed a breakout board called the knit which includes a Marvell MW300 WiFi SOC. This chip has an onboard ARM Cortex M4F running at 200 MHz, which means you’ve got a lot of everything to play with: flash memory, RAM, a floating-point unit, you name it. And Marvell’s got an SDK for using AWS that includes things like an operating system and peripheral support and other niceties. TLS 1.2 is included.
Best of all, a MW300 breakout is reasonably affordable (though more expensive than the mass-produced ESP8266 modules, naturally) and it’s an entirely open design. [Anuj] also seems to be setting up for a production run, if you don’t feel like making it yourself.
The MW300 is in all sorts of commercial IoT designs, and it’s a battle-tested go-to for interfacing with “the cloud” securely. The only hobbyist-friendly board that’s similar is the Adafruit WICED WiFi Feather, but it’s more expensive, less powerful, and out of stock at the moment, which just shows the demand for something like this.
Of course, if you need more integrated peripherals, you could just hack up a “Hello Barbie” toy which has the same chip as well as sweet audio codecs and a nice fat flash ROM.
We think it’s neat that [Anuj] would make and test a breakout for this powerful little WiFi SOC. We don’t need one for our projects right now — we’re running in entirely insecure mode — but it’s good to know what your options are. (We’re also looking into esp-open-rtos for the ESP8266 — we know they’ve been working on TLS 1.2 encryption, but we don’t know what their status is at the moment. Anyone?)
“It’s not a bomb,” the mailman whispered to himself as he reached for [atxguitarist]’s mailbox, giving a nervous glance at the small black box stuck to the side. “This is THAT house, it’s not a bomb. I’m sure it’s not a bomb,” he muttered as a cold bead of sweat ran down his neck. His hand approached slowly, shakily. The mailman gathered courage, then, in a single quick movement, opened the box. He sighed relief as nothing happened. Somewhere in [atxguitarist]’s house a recording wailed “You’ve got mail!”
The mailbox enhancement in question is a hacked Amazon Dash Button in a project box. When the door of the mailbox is opened, a magnetic reed switch simulates a button press on the Dash. The Dash transmodulates the signal into WiFi pixies which are received by a Raspberry Pi. The Pi’s sole purpose in life is to run a 24-line Python script that plays the famous sound from AOL’s mail software and sends a notification to his phone.
Aside from unnerving the mailman, it’s a cool hack and keeps you from slugging it out there in the cold or rain to witness an empty box.
Continue reading “Make Your Mailman Nervous With A Wifi Enabled Mailbox”