Chip-cn-dat/Vollgo-dat/EV1527-dat/2025-07-04-18-47-48.png
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Chip-cn-dat/Vollgo-dat/EV1527-dat/EV1527-dat.md
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+
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+# EV1527-dat
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+
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+## Info
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+
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+chip info, datasheet == [[EV1527.pdf]], etc.
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+
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+EV1527 is a widely used **fixed-code OOK (On-Off Keying) modulation** scheme that transmits a **20-bit ID** plus **4-bit data**. The encoding consists of a preamble, a synchronization bit, and the data transmission using a specific pulse width format.
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+
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+- [[OOK-dat]]
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+
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+
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+Originally, EV1527 was a proprietary chip manufactured by a Chinese company which then found so widespread adoption in affordable remote controls that its encoding scheme became a standard by itself.
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+
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+EV1527 uses a fixed message format and does not have cryptographic protection. It is vulnerable to replay attacks where an attacker would listen for RF transmissions from a remote control, then play it back later to mimick the original remote control.
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+
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+However, radio waves are public. Anyone can listen in, or send. **EV1527 is not encrypted and uses repetitive (predictable) messages.**
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+
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+## not security critical
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+
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+EV1527 is great for any simple microcontroller-free scenario that is not security critical. Use it for toys, to turn on garden lamps, or alike.
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+
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+**Microcontroller Available:** If your project already uses a microcontroller, use a generic OOK sender/receiver and implement the encoding yourself/sniffingrfremotes/). This way, you can add security features such as rolling codes and encryption.
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+
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+If your project is security critical, consider wireless methods that come **with encryption by default (i.e. ESPNow, WiFi, etc.).** At minimum, use rolling codes that cannot be easily captured and replayed. EV1527 can be used in replay attacks from anyone close enough to receive the signals from your remote control.
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+
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+Keep in mind that especially **a garage door opener** is a **highly security-sensitive device**. Anyone close enough to pick up your remote control signal can gain entry at his or her convenience when the remote control uses EV1527.
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+
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+
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+## RF and Frequencies
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+
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+Typically, EV1527-compliant remote controls use the license-free 315MHz ISM band in the US, and the license-free 433MHz ISM band in Europe and Asia.
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+
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+- 315.00 MHz: the 315MHz band has just one channel at exactly **315.00MHz.**
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+- 433.92 MHz: the 433MHz band has a total bandwidth of 1.72MHz, offering room for up to **174 channels**.
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+- EV1527-devices operate on channel 87 (**433.92 MHz**) which is the center frequency of this band.
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+
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+
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+## Transmitter == OOK Sender
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+
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+![](2025-07-04-18-47-48.png)
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+
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+- 4x button version
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+- 12V 27A battery == [[A27-battery-dat]] -> [[battery-alkaline-dat]]
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+
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+
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+
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+## App.
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+
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+- [[RF-link-dat]]
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+
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+## ref
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+
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+- [[EV1527]]
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+
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+- https://done.land/components/data/datatransmission/wireless/shortrangedevice/am/ask/ev1527/
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Chip-cn-dat/Vollgo-dat/EV1527-dat/EV1527.pdf
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Chip-cn-dat/Vollgo-dat/Vollgo-dat.md
Tech-dat/Network-dat/RF-dat/RF-LINK-dat/RF-LINK-dat.md
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@@ -184,9 +184,9 @@ If you're using **common learning-code RF modules**:
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## chip options
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-- [[SYN480-dat]] - [[SYN115-dat]]
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-
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+- [[SYN480-dat]] - [[SYN115-dat]] - [[SYN470-dat]]
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+- [[EV1527-dat]]
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191 191
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## code
Tech-dat/hack-dat/hack-dat.md
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+
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+# hack-dat
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+
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+## ref
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+
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+- [[hack]]
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power-dat/battery-dat/battery-9V-dat/battery-9V-dat.md
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@@ -1,5 +1,5 @@
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-# 9V-battery-dat
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+# battery-9V-dat
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4 4
5 5
### Professional Name of Common 9V Battery
power-dat/battery-dat/battery-alkaline-dat/A27-battery-dat/A27-battery-dat.md
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+
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+# A27-battery-dat
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+
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+# 🔋 12V 27A Battery (A27)
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+
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+A **12V 27A battery** (also known as **A27**, **27A**, or **MN27**) is a small, cylindrical **alkaline battery** used in compact electronic devices.
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+
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+## 📋 Specifications
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+
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+| Property | Value |
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+|----------------------|----------------------------------------|
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+| **Voltage** | 12V |
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+| **Diameter** | ~8.0 mm |
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+| **Length** | ~28.2 mm |
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+| **Chemistry** | Alkaline (MnO₂/Zn) |
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+| **Capacity** | 20–30 mAh |
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+| **Common Use Cases** | Car remotes, garage openers, doorbells, small electronics |
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+| **Other Names** | A27, 27A, MN27, GP27A, L828, EL812, 27AE |
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+
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+## ⚠️ Important Notes
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+
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+- The **“27A”** refers to the model number, **not 27 amps of output**.
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+- It is **not suitable** for high-drain devices like motors or LED strips.
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+
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+## 🔄 Alternatives for Higher Power Needs
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+
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+If you need more current or rechargeable options:
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+- **12V Li-ion packs** (e.g., 3S 18650 battery pack)
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+- **12V Sealed Lead Acid (SLA) batteries**
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+- **12V LiFePO₄ batteries**
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+
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+
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+## ref
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+
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+- [[battery-alkaline-dat]]
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power-dat/battery-dat/battery-alkaline-dat/battery-alkaline-dat.md
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@@ -1,7 +1,7 @@
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-# alkaline-battery-dat
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-
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+# battery-alkaline-dat
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+- [[AA-battery-dat]] - [[AAA-battery-dat]] - [[A27-battery-dat]]
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## explosion and fire
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power-dat/battery-dat/battery-dat.md
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@@ -10,7 +10,7 @@
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11 11
- [[battery-charger-dat]] - [[2S-lithium-battery-charger-dat]]
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-- [[alkaline-battery-dat]] - [[9V-battery-dat]]
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+- [[battery-alkaline-dat]] - [[battery-9V-dat]]
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- [[battery-soldering-dat]] - [[battery-tester-dat]]
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