diff --git a/_posts/2024-11-20-JLCPCB-STM32s.md b/_posts/2024-11-20-JLCPCB-STM32s.md
index 97b6508..dd02684 100644
--- a/_posts/2024-11-20-JLCPCB-STM32s.md
+++ b/_posts/2024-11-20-JLCPCB-STM32s.md
@@ -30,5 +30,6 @@ Here are some STM32s which fit these capabilities and are available on JLCPCB, a
 | **STM32F412RET6** | ✅       | 2.658      | 512        | LQFP-64      | ✅    | ✅   | ✅   | Very capable processor, the cheapest one matching the criteria AND has DSP instructions. Has two CAN interfaces.                                                                                  |
 | **STM32F407ZET6** | ✅       | 2.704      | 512        | LQFP-144     | ✅    | ✅   | ✅   | Huge package                                                                                                                                                                                      |
 | **STM32L476RET6** | ✅       | 2.713      | 512        | LQFP-64      | ✅    | ✅   | ✅   | The cheapest matching the criteria in the L4 lineup.                                                                                                                                              |
+| ESP32-S3FH4R2     | ✅       | 2.67       | 4096       | QFN-56       | ✅    | ✅   | ✅   | Yes, but it's power hungry and does not have enough I/O for my application.                                                                                                                       |
 
 Feel free to comment below your favorite MCUs on JLCPCB, I'm interested in hearing about it (especially if you have one that does BLE, CAN, SDIO, USB and has more IO than an ESP32-S3 and less power consumption).
\ No newline at end of file
diff --git a/_posts/2024-11-25-Chinese-ZHONGKEWEI-ATGM-GNSS-modules-comparison.md b/_posts/2024-11-25-Chinese-ZHONGKEWEI-ATGM-GNSS-modules-comparison.md
new file mode 100644
index 0000000..8ee50a8
--- /dev/null
+++ b/_posts/2024-11-25-Chinese-ZHONGKEWEI-ATGM-GNSS-modules-comparison.md
@@ -0,0 +1,42 @@
+---
+title: Chinese ZHONGKEWEI ATGM* GNSS modules comparison
+author: peter
+date: 2024-11-25 04:00:36 +0800
+categories: [Electronics]    # 0-2 categories. Blogging | Electronics | Programming | Mechanical | SelfHosting | Guides | University
+tags: [gps,gnss,cheap,comparison,ublox]   # 0-\infty. systems | embedded | rf | microwave | electronics | solidworks | automation | tip
+# image: assets/img/2024-11-25-Chinese-ZHONGKEWEI-A/preview.png
+---
+
+The ZHONGKEWEI ATGM* series of GNSS modules appear to emulate the popular u-blox NEO and MAX series and are (almost) pin compatible.
+
+| Model                | GPS | BDS | GLONASS | Galileo | QZSS | VCC [V] | Interfaces           | Internal SOC | TTFF [s] | Maximum output rate [Hz] | CEP50 [m] | Cost [AUD] |
+| -------------------- | --- | --- | ------- | ------- | ---- | ------- | -------------------- | ------------ | -------- | ------------------------ | --------- | ---------- |
+| ATGM332D-6N-74       | ✅   | ✅   | ✅       | ✅       | ✅    | 2.7-3.6 | UART,I2C,SPI         | AT6668       | 23       | 10                       | 1.5       | 5.3287     |
+| ATGM336H-6N-74       | ✅   | ✅   | ✅       | ✅       | ✅    | 2.7-3.6 | UART,I2C,SPI         | AT6668       | 23       | 10                       | 1.5       | 5.3171     |
+| ATGM336H-5N31        | ✅   | ✅   | ❌       | ❌       | ❌    | 2.7-3.6 | UART1,UART2          | AT6558       | 32       | 10                       | 2.5       | 4.6255     |
+| ATGM332D-5N31        | ✅   | ✅   | ❌       | ❌       | ❌    | 2.7-3.6 | UART1,UART2          | AT6558       | 32       | 10                       | 2.5       | 4.1224     |
+| ATGM332D-5NR32       | ✅   | ✅   | ❌ (?)   | ❌       | ❌    | 1.8-3.6 | UART1,UART2          | AT6558R      | 32       | 5                        | 2.5       | 4.0525     |
+| ATGM336H-5NR32       | ✅   | ✅   | ❌ (?)   | ❌       | ❌    | 1.8-3.6 | UART1,UART2          | AT6558R      | 32       | 5                        | 2.5       | 3.8498     |
+| ATGM332D-5N11        | ✅   | ❌   | ❌       | ❌       | ❌    | 2.7-3.6 | UART1,UART2          | AT6558       | 32       | 10                       | 2.5       | 5.9460     |
+| ATGM336H-5N11        | ✅   | ❌   | ❌       | ❌       | ❌    | 2.7-3.6 | UART1,UART2          | AT6558       | 32       | 10                       | 2.5       | 5.0609     |
+| NEO-M9N (**u-blox**) | ✅   | ✅   | ✅       | ✅       | ✅    | 2.7-3.6 | UART,I2C,SPI,**USB** | UBX-M9140-KB | 24       | **25**                   | 2.0       | 45         |
+
+These parameters seem to be the same for all ATGM modules:
+
+| Key                          | Value    | Note                     |
+| ---------------------------- | -------- | ------------------------ |
+| Cold start sensitivity [dBm] | -148     |                          |
+| Tracking sensitivity [dBm]   | -162     |                          |
+| Protocols                    | NMEA0183 |                          |
+| Battery and RTC              | ✅        |                          |
+| Lockout speed [m/s]          | 515      | Not specified on AT6668? |
+| Lockout altitude [m]         | 18000    | Not specified on AT6668? |
+| Lockout acceleration [g]     | 4        | Not specified on AT6668? |
+
+The main differences compared to the NEO-M9N are:
+
+- Significantly lower cost
+- Lower maximum output data rate of only 10 Hz
+- Slightly higher lockout speed of 515 m/s
+- Lower lockout altitude of 18000 m (compared to 80000 m)
+- Lacks USB and lacks UBX or any binary output format