- #WINDOWS IOT I2C BLIND WRITE HOW TO#
- #WINDOWS IOT I2C BLIND WRITE CODE#
Note: for being able to write a new firmware or to communicate with an ESP module by using a computer, you'll need a USB-TTL module, such as the CP2102 IC based one, shown in Figure 4.
However, if the ESP8266 module is used as an UART WiFi interface only, then you'll not really use the GPIO pins, so you may ignore this when selecting the board that suits your needs. All these features are quite important if you are using the ESP8266 module as standalone controller board. Up to 16 GPIO pins are available, from which one has 10Bit ADC capabilities, and supports I2C, I2S, SPI and UART communication protocols. It has 64 KB instructions RAM, 96 KB data RAM, it and supports external QSPI flash - 512 KB to 4 MB (but also up to 16MB is supported).
MCU features: these modules are driven by a low power 32-bit RISC CPU (Tensilica Xtensa LX106) running at 80 MHz. For our purpose, a minimum of 1MB (8MBit) Flas is required, but we recommend 4MB+ (16MBit+). For example, if the number on the flash IC starts with 25Q80 then it is a 8MBit Flash, while if it starts with 25Q40 then it is a 4MBit one. Excepting the case of ESP06, ESP07, ESP08 and ESP12E/F modules, where a hard to remove metallic shield covers the CPU and flash ICs, one can simply check the flash size by reading the text on the 8 pin black IC soldered near the MCU (which is the square black IC with pins on all four sides). In many cases, it is also possible to increase the flash capacity of such a module, but for this, one needs good soldering skills to remove the old flash IC and solder the new one, and usually the price of the flash IC bought in small quantities is about the same as for the price of the complete ESP8266 module (or even more!), thus defeating the purpose. flash memory size: the ESP8266 modules come with permanent flash memory ranging from 4MBit (512KB) up to 16MBit (2MB), but some may even go up to 128MBit (16MB). Our tip for the ESP02 module: plug the pin headers into a breadboard, align the module on top of them, then solder. Such connections are somehow harder to solder, specially for a beginner. Notice that some of the breadboard friendly modules have only a "half-way" pin connections, e.g., ESP02 module. Last, other modules, such as ESP01 have a pitch of 2.54mm, but they have a two rows header, which makes it impossible to be used with a breadboard, because of the implied short-circuit between the pins. Other modules, such as ESP07 or ESP08 have a pitch of 1.27mm, thus you'll only be able to use them with a breadboard when using an adapter. Some of the modules, such as ESP02, ESP03 and ESP05 (see Figure 1) are breadboard friendly, having a pitch of 2.54mm (the distance between two pins). usability on a breadboard: most of the times we prototype on a breadboard, therefore we should be able to easily connect (or plug) these modules to such a board. We see three main points to be considered when choosing an ESP8266 module for a specific project: These are not just "blind" WiFi communication modules, but small development boards, containing a programmable MCU and builtin GPIO pins, thus it can do tasks similar with the ones possible with the Arduino boards, but being much faster and in some sense more capable. There is no perfect answer for this question, and it highly depends on what you are using the WiFi module for. Having multiple variants of ESP8266 module, comes the question: "which one should I use ?". Choosing the Appropriate ESP8266 Module for a Project No need for special communication channels or frequencies, such as the 433MHz band required by some wireless modules. It means they can connect to a standard WiFi network, such as the ones provided by an WiFi router, WiFi repeater or access point (AP). These modules use the 802.11b/g/n WiFi standard, operating at 2.4 GHz. Figure 1: Variants of the ESP8266 Module. Various modules built around the ESP8266 IC are available, and the most common 12 standard modules are shown in Figure 1. With a single small and cheap board, it is possible to have a JavaScript interpreter, WiFi client, WiFi router, HTTP client and server and GPIOs control, therefore allowing to read sensors, control actuators and use human interface devices, such as displays, buttons or joysticks. #WINDOWS IOT I2C BLIND WRITE CODE#
Currently, two firmware versions allow JavaScript code execution on an ESP8266: Mongoose-IoT (that we'll discuss about in this tutorial) and Espruino for ESP8266.
#WINDOWS IOT I2C BLIND WRITE HOW TO#
This article focuses on discussing how to use JavaScript to program an ESP8266. The ESP8266 micro-controller module gained huge popularity over the last few years, being a small module with a powerful MCU, SPI Flash, 2.4GHz 802.11 b/g/n WiFi capabilities and relatively small power consumption, all for just a few dollars.
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